[ Grammar ]
Trainees ___ required to have a working device at all times.
A. is
B. was
C. are
D. were

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Modal Verbs › View. Dolphins ___ communicate through a series of clicks and whistles.
A. can
B. could
C. able to
D. must
Grammar › View
What is one rule that is followed in the sentence?
How about a job? I could work for the park, like you.
A. The pronoun “I” is capitalized.
B. Capitalization of places
C. Capitalization of months of the year