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The boss makes the workers ________ long hours every day.

A. work B. to work C. works D. working

We had fun ________ the robots do many different kinds of things.

A. to watch B. watched C. watching D. watches

—Will you please ________ do that? —OK, I won’t.

A. won’t B. not C. don’t D. can’t

We really don’t know _______. Could you help us?

A. how to do B. what to do

C. to do what D. to do how

I won’t leave here until my mother _______ back.

A. will come B. is coming C. came D. comes

—_______? —My watch doesn’t work.

A. Why are you here B. How do you do

C. What’s wrong D. What’s this

She told us that she _______ her handbag on the bus.

A. left B. forgot C. missed D. failed

He _______ eight hundred thousand dollars for his Benz(奔馳) car.

A. paid B. cost C. took D. spent

Yesterday, a man said he saw _______ UFO in the park. The police are looking for _______ UFO now.

A. an; the B. the; the

C. a; the D. the; an

—What was Tom doing _______ it was raining?

—He was doing his homework in the bedroom.

A. since B. while C. when D. if