[ Grammar ]
Are you afraid _____ spiders?
A. for
B. of

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Vocabulary › ViewThe effort that people devote to a task for which they are paid
A. Efficiency
B. Labor
C. Opportunity cost
Phrasal Verb Put & Go › View
The bomb go _____ but fortunately no one was seriously injured.
A. off
B. for
C. after
Vocabulary › Viewfrigid
A. extremely cold
B. to turn about on an axis or a center
C. the surface of the land and its features
D. an organization in the United States that directs space travel and research
Present Simple › View
They ____ not walk to school.
A. are
B. does
C. do
D. is