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题型：单选题题类：常考题难易度：普通

——The math problem _________ is not difficult.
——But after several tries , I have to give up _________ on it .

A、it's , working B、itself , to work C、itself , working D、its , to work

举一反三

My teacher devoted her whole life to {#blank#}1{#/blank#} (teach).

My brother wants to join the{#blank#}1{#/blank#} (swim) club.

Do you have a {#blank#}1{#/blank#} (swim) club in your school?

What about {#blank#}1{#/blank#}(take) a walk after supper?

—___________good care of pets can make children kind-hearted.

—Yes. It is a good idea ___________pets.

用方框中所给词语的适当形式填空

go; hear from; be proud of; stranger; hard

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