He is not what he ______

A. would be B. used to be C. was used to be D. was used to being

Wood ______ make paper.

A. used to B. using to C. is used to D. get used to

我以前总是骑自行车上学,但是现在我习惯于步行去学校.

I used to go to school by bike and now I am used to walking to school.

这刀是用来削苹果的。 The knife is used to cut apples.

2.challenging adj. 具有挑战性的

The job is challenging. Have you prepared well?

这工作富有挑战性，你准备好了吗？

Some sports are challenging and many young men like them.

有些运动富有挑战性，许多年轻人喜欢。

【用法点拨】：形容词challenging表示"主动"意义，所以它一般用来修饰事物，而不用于修饰"人"。如：a challenging role 具有挑战性的角色

challenge n. / v. 挑战 作动词时用于challenge sb.... to sth ...或challenge sb.... to do ...结构，意为"向......挑战......"。

如：他向我挑战要我跟他再打一场网球.

当今社会充满了机遇与挑战。

* what是连接代词，不仅引导名词性从句，而且在从句中充当一定的成份，如主语、宾语或表语。

The important thing is what you do, but not what you say. 重要的是你做什么，而不是说什么。

What made school proud was that more than 90% of the students had been admitted to key universities.使学校引以为豪的是90%以上的学生被重点大学录取。

【即学即用】

1）A computer can only do _________ you have instructed it to do.

A. how B. after C. what D. when

2）Perseverance(坚定) is a kind of quality ---- and that's _________it takes to