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题型：单选题题类：常考题难易度：普通

—What do you think of Ann?
—Ann is so careful that she always goes over her exercises to ______ there are no mistakes.

A、look for B、make sure C、find out D、think about

举一反三

Jenny ________ her mother, and her mother _________ very young.

Some organizations have been__________ to help the poor students in the western areas of China.

The students their pens when the teacher told them to stop writing.

我们很想弄清恐龙为何灭绝。

We want to know why the dinosaurs{#blank#}1{#/blank#} {#blank#}2{#/blank#}.

在公共场合，插队是不礼貌的。

It's impolite to {#blank#}1{#/blank#} before others in public.

What else do you do to keep f{#blank#}1{#/blank#} besides running?

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