单项选择题

Despite much research, there are still certain elements in the life cycle of the insect that ______ not fully understood.

A. are
B. were
C. is
D. was
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单项选择题
Each of the students in our class ______ great interest in English and they each ______ a copy of A New English-Chinese Dictionary.
A. shows; have
B. have; has
C. is; have
D. takes; has
单项选择题
Jim was late for two classes this morning. He said that he forgot both of the ______.
A. rooms number
B. room number
C. room's number
D. room numbers
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