n’t be able to come next week, because she_________ herself in Mount Tai then.

Nothing is so easy asparents raise their expectations of their children too high

The old man often advised the young workers on _________the machine and they learned quickly.[ ]

When you go _______ the street, you must look at the traffic lights. When it’s red, you must stop.

Have you finished your homework __________— Yes， I’ve __________ finished it.