The university estimates that living expenses for international students ______ around $8,450 a year, which ____ a burden for some of them.A are;are B. is;are C. is;is D. are;is
Lily _____ a book about China last month but I don’t know whether she has finished it.
I first met Lisa three years ago. She _____ at a radio shop at that time.
I don’t work here; I _____ until a new secretary arrives.
—I’m sorry to keep you waiting. —Oh, not at all. I _____ here only a few minutes.
—Who is Clarke? —_____ him yet? I saw you shaking hands with him at the meeting.