__________ she had a change of heart, she decided to cancel the trip.
A
Because
B
Although
C
Unless
Explanation
"Because" is used here to introduce the reason why she decided to cancel the trip (the change of heart).
You need to exercise regularly; __________, your cardiac muscles will weaken.
A
otherwise
B
moreover
C
therefore
Explanation
"Otherwise" is used to indicate the negative consequence that will occur if the requirement (regular exercise) is not met.
__________ the outbreak was unexpected, the government responded quickly.
A
Despite
B
Although
C
Because
Explanation
"Although" is a conjunction used to introduce a contrast between the unexpected nature of the outbreak and the speed of the response.
She is not only a pediatrician __________ also a researcher.
Explanation
The correct correlative conjunction pair is "not only... but also".
He studied hard; __________, he passed the medical exam.
A
however
B
consequently
C
nevertheless
Explanation
"Consequently" is used to show the result or effect of studying hard.
__________ the virus mutates, existing vaccines may become ineffective.
A
Unless
B
If
C
Otherwise
Explanation
"If" introduces a condition that leads to the potential ineffectiveness of the vaccines.
She works as a therapist __________ helps many people with anxiety.
Explanation
"And" is used to join two complementary pieces of information about her work.
__________ the medication, his condition worsened.
A
Because
B
Despite
C
Although
Explanation
"Despite" is a preposition used to show contrast, followed here by the noun phrase "the medication".
You can see a psychiatrist __________ a psychologist; both can help.
Explanation
"Or" is the correct conjunction to offer a choice between two options.
Not only __________ he exercise regularly, but he also eats healthy.
Explanation
When a sentence starts with "Not only", inversion occurs. For the third person singular "he" in the present tense, the auxiliary "does" is used.
Never __________ I seen such an unprecedented outbreak.
Explanation
Inversion after "Never" with the subject "I" in the present perfect requires "have".
Only after taking the vaccine __________ she feel safe.
Explanation
Inversion after an "Only after..." phrase. "Did" is used for the past tense to accompany the base form of the verb "feel".
Seldom __________ the therapist cancel appointments.
Explanation
Inversion after the negative adverb "Seldom". "The therapist" is a singular subject, so "does" is used.
No sooner __________ the mutation discovered than researchers started working on a booster.
Explanation
"No sooner was the mutation discovered" is a passive inversion structure expressing that one event happened immediately after another.
Under no circumstances __________ you skip your medication.
Explanation
Inversion after the negative phrase "Under no circumstances". "Should" is the modal verb used to express strong obligation or medical advice.
Rarely __________ he take things to heart.
Explanation
Inversion after "Rarely" for the singular subject "he" in the present tense.
Not until the symptoms appeared __________ he visit a doctor.
Explanation
With "Not until", inversion occurs in the main clause. "Did" is used for the past tense of the main action.
So serious __________ the situation that the army was called.
Explanation
Inversion for emphasis starting with "So + adjective". "The situation" is singular, so "was" is used.
Little __________ they know about the new virus strain.
Explanation
Inversion after "Little". "Do" is used for the plural subject "they" in the present simple.
He recommended __________ the vaccination immediately.
Explanation
The verb "recommend" is followed by the gerund form (-ing).
She is used to __________ long hours at the hospital.
A
work
B
working
C
to work
Explanation
The expression "be used to" is followed by a gerund.
It's no use __________ about the outbreak now.
A
worry
B
worrying
C
to worry
Explanation
The phrase "it's no use" is followed by the gerund form.
He pretended __________ the mutation, but he didn't.
A
understand
B
understanding
C
to understand
Explanation
The verb "pretend" is followed by the to-infinitive.
I look forward to __________ from the neurologist soon.
A
hear
B
hearing
C
to hear
Explanation
The phrasal verb "look forward to" requires a gerund.
They decided __________ the vaccine trial.
A
join
B
joining
C
to join
Explanation
The verb "decide" is followed by the to-infinitive.
She admitted __________ the mistake in the lab report.
A
make
B
making
C
to make
Explanation
The verb "admit" is followed by the gerund form.
He can't help __________ about the future of medicine.
A
worry
B
worrying
C
to worry
Explanation
The expression "can't help" is followed by a gerund.
The doctor refused __________ the patient without insurance.
A
treat
B
treating
C
to treat
Explanation
The verb "refuse" is followed by the to-infinitive.
After __________ the symptoms, she called the emergency number.
A
notice
B
noticing
C
to notice
Explanation
The preposition "after" is followed by a gerund.
What does the honeybee's waggle dance communicate?
A
The taste of nectar
B
Distance and direction to food
C
The number of flowers
Explanation
According to the passage, honeybees perform a 'waggle dance' that encodes both distance and direction to food sources.
