Ⅲ. Fill in the blanks with the proper forms of the given words.
1. You shouldn’t go to bed just after (eat) a heavy meal.
2. I don’t know when he (come). When he (come), I’ll call you.
3. My father used (walk) to work. Now he drives to work.
4. Cameras are used (take) pictures.
5. Are you used to (live) alone?
6. Knives are used for (cut) things.

1. eating
2. will come; comes
3. to walk
4. to take
5. living
6. cutting

1. after是介词，后面接动词-ing形式，所以填eating。
2. 第一空：我不知道他什么时候来，表示将来的动作，用will come；第二空：When引导的时间状语从句，遵循“主将从现”原则，主语he是第三人称单数，所以填comes。
3. used to do sth.表示“过去常常做某事”，所以填to walk。
4. be used to do sth.表示“被用来做某事”，所以填to take。
5. be used to doing sth.表示“习惯于做某事”，所以填living。
6. for是介词，后面接动词-ing形式，所以填cutting。

Ⅳ. Choose the proper forms of the following phrases to fill in the blanks.
be used as be used to (do) be used for be used to (doing) used to (do)
1. He be a teacher, but now he is a businessman.
2. Locks locking the doors.
3. Japanese the second foreign language in many universities in China.
4. People surfing the Internet now.
5. Wood can make paper.

1. used to 2. are used for 3. is used as 4. are used to 5. be used to

1. "used to (do)" 表示过去常常做某事，现在不做了，符合“过去是老师，现在是商人”。
2. "be used for" 后接名词或动名词，“locking”是动名词，锁被用于锁门，用 "are used for"。
3. "be used as" 表示“被用作……”，日语被用作第二外语，用 "is used as"。
4. "be used to (doing)" 表示“习惯于做某事”，人们现在习惯上网，用 "are used to"。
5. "be used to (do)" 表示“被用来做某事”，木头能被用来造纸，用 "be used to"。