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______ their homework, these three students have to stay in the classroom for another thirty minutes.

— Do you know the tower _____ in the heart of the city?
— Do you mean the one _____ to the north of the city library?

I climbed the stairs slowly with a big suitcase, my father         with two more.

Today the number of people ________ English in China is increasing rapidly.

The boy was beaten by his stepmother, tears _______ down his cheeks quietly.

All cases ______ children are dealt with in a special children’s court.

The computer doesn’t work well and it requires _____ but the manager requires me _____ to use it.

Take care not to get your shoes ______ in mud．

Remember never to leave your dog ______. It might bite people around.

— It is understandable for him to make such mistakes.
— You are right, ______ that he is only a new hand.