—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
________ take the aeroplane all the way, they decided to fly to Vancouver and then take the train from west to east across Canada.
It’s heavy, but I can ________ to carry it upstairs.
---- It is a long time since I saw my sister. ----________ her this weekend?Why not to visit B. Why not visit C. Why not visiting D. Why don’t visit
What _______ the foreign experts most is that the new factory is perfectly environment-friendly.
Can you make sure_______ the gold ring?