Do you buy these sweaters______Shanghai?—Yes. I sell them ______the people in Suzhou. [ ]

The girl is too young to look after __________. You shouldn’t leave her at home _________.

What do you think of the book ? —–It is so , and I feel

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

The boy likes to play ______ his friends.[ ]