----How old _________they? ----I don’t know.A.are B.is C.am
---- Hi, Tom. Can you _________ me the way to Beihai Park?--- ___________, I don’t know.
--- The chair is _________. Can you repair it?---- Let me try.
---- Can you ________ these exercise-books to the teacher’s office, please.---- Sure.
Hi, John. ___________ write on the wall. __________ the wall clean.
______________ eat too much candy. It’s bad ___________ your teeth.