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选择
The shelf _____ yellow.
A. is B. are C. am
选择正确答案
There are minutes in half an hour.
A. hours B. thirty C. minutes
选择适当的答案
--______ you walk?
--Yes, I can.
A. Do B. Are C. Can
____ there a lot of people?
A. Are B. are C. Is
选择合适的答案
--Sorry, I ______ late.
--That's Okay. But please be on time from now on.
A. am B. are C. be