–Is that Kate’s car?--It ______be hers. She has just gone for a meeting.A. can’t B. may C. mustn’t
__________he is ill, __________he goes to school.
The story is about Lei Feng.It's very ______.
—Which is______,the sun,the moon or the earth?—Of course,the moon is.
I bought ______ for my son,but ______ for myself.
—______ you in America in 1999?—Yes, I ____________.