We all like to talk to our teachers ____our computers.A. in B. by C. at
—Hi,can I help you? —________.
Jenny,put on your coat ________ you will catch a cold.
—Can I borrow your dictionary? —Yes,you ________. A.can B.must C.should
—Do you know the song Come on,Haixi? —Yes,and I ________ sing it well. A.must B.can C.need
John can play ________ guitar,but he can’t play ________ chess. A.the;/ B./;the C.the;the