She has ________ to Dave for about three years.

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I ________Ye Jun two years ago.

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－What ________ this piece of cloth used for? －It is used for ________ the table clean.

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I noticed him ________ the teacher's office just now.

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Dr Bethune was busy ________ the wounded soldiers.

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He's seen drawing under the tree over there now, ________ he?

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________ books must be produced for the children.

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Not only you bat also he ________ to go there at once.

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－Have all the students known that our class will visit the factory this afternoon?

－Yes. Every student ________ about it.

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①－I won't come to the party unless Sue ________, too.

－You mean if Sue comes you'll come?

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②Mr Johnson's story ________ by everyone who heard it.

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