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题型：单选题题类：常考题难易度：普通

Volunteering our time to help people ________ a good way to _______our free time.

A、be; spend B、are; cost C、is; spend D、will; cost

举一反三

— When did the factory develop the new machine?

— Last year.

They win the game, so they were unhappy.

When I first came to the class, the teacher asked me to myself.

When you _______ your ideas, you are talking or writing about something that you are thinking or feeling.

She always _______ too much time playing computer games.

Lisa often __________ jokes after class, and we all like her.

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