I. 根据句意及首字母提示, 在下面空白处填上一个适当的词, 使该句子完整、正确
1. I prefer c         shirts to silk ones.
2. Jim is wearing a new j         today.
3. We can’t go in, because the door is l          .
4. The shop owner uses the house to s        food and vegetables.
5. We use a c        to take pictures.
6. More and more t       come to visit the Great Wall.
7. My father bought a new TV s        last week.
8. S_______ are used for posting letters.
II. 用括号内所给动词的适当形式填空
1. Keys _______(use) by people for _______(lock) doors. 
2. I don’t know how _______(answer) this question.
3. The teacher told him _______(not be) late.
4. I won’t go to see you if it _______(rain) tomorrow.
5. _______ you _______(finish) your homework yet?
6. Look at the dark cloud! It _______(rain) soon.
7. —How long _______ Peter _______(be) here since he came here?
    —Five years.