I think students should have mobile phones to call their parents.—___________. They often use them to play games instead.

What does the notice on the wall say — “No person _____ take books out of thereading room; otherwise he _____ be fined”

13 The struggle against the bird flu and the suffering _________ brought about have become a big concern across the world

The window is dirty.—I knowIt ______ for weeks

It took us about ________ to fly to Hong Kong.