Teachers should not be too strict teenagers. [ ]

I think she must stay _____ home. [ ]

Would you like _________ Shijing Hill with us next Sunday afternoon?—I will go with you unless my mother _________me．

Did your classmates have a good time in the Disneyland last weekend?—Yes. They enjoyed _________ very much.

scientists have done a lot of research on A (H1N1) flu, there are still some cases for further study.[ ]