1.Sam doesn't have to be made____(learn).He always works hard.

【答案：to learn; 使役动词make/have/let其主动结构，后接省略to的不定式，变为被动语态则需补充to】

2.The girl was beginning __________.

A:get angry. B:to get angry. C:getting angry .D:angry.

【答案：B。begin后既可以接doing又可以接to do；而接不定式表“一次性、具体的动作”；接doing表“抽象意义”；依据句意，表女孩开始生气，用一次性具体动作好一些；】

3.Nothing is difficult if you put your heart into it,______ ?

A; aren't they B: isn't it C;is it D :aren't it

【答案：C。考查不定代词的反义疑问句，前否后肯，则排除选项A、B、D；令不定代词nothing的指代词用it】

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