—What are you doing?I’m looking ___ the children. They should be back for lunch.
—What time will Mr. Green be back to China? —Sorry. I don’t know ________.
—How ____ the medicine tastes! —Yes. But the medicine will really work soon after you take it.
—What about _____ English-Chinese dictionary on the bookshelf? —In my opinion, it’s _____ useful tool book for my English learning.
Sandy was ________a bad mood and nobody could __________yesterday.
—How about singing songs with me? —I’m sorry I can’t. I help my father with his work. A. have to B. can C. may