We can't do it well if you don't help us.

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He pretended ________ a book when his father came back.

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When you cross the street, you should be careful ________ the cars in the street.

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There is a ________ look on her face.

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Coming late means ________ a mistake.

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He ________ a dream in which he saw his father.

[　　]

What ________ to Carla last night? What did she cry for?

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(河北省2005)

We have worked for three hours. Now let's stop ________ a rest.

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I'll try ________ the same mistake again.

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Listen! There must be someone ________ at the door.

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