You know a lot about Chinese history, don’t you?–Yes, I ___________ China for a long time since 1998.

Tom often helps me ______ my English. [ ]

Tom can’t find his gloves. Are these blue gloves his?—No, they _ be his. His gloves are black.

There are classrooms on the ground floor. One of them is ours.

Mrs Smith has a cute baby. It often smiles at people _________.