Question

1. the collection of antique coins ___ stored in a locked glass case at the museum.

a. are
b. were
c. is
d. have been

1. the students in the advanced biology class ___ planning their research presentations next week.

a. is
b. was
c. are
d. has been

Explanation:

1. For the first sentence, the subject is "The collection" (singular). The verb should agree with the singular subject. "Is" is the correct present - tense singular form.
2. For the second sentence, the subject is "The students" (plural). The verb should agree with the plural subject. "Are" is the correct present - tense plural form.

Answer:

1. C. is
2. C. are