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

Theyhere on foot yesterday.

Linda’s mother baked a cake _____ her on her birthday.[ ]

Did the actor live alone in his house? —Yes. He has a wife and two children. But ____ of them lives with him.

Which team do you think ______ the game?—Hard to say. There are still ten minutes before it ends.