II. Rewrite the following sentences as required.
按要求转换下列句子，每空一词。
1. Zhuge Kongming used sky lanterns first. (改为被动语态)
Sky lanterns first Zhuge Kongming.
2. They plant trees and grass in this area. (同上)
Trees and grass in this area.
3. Careless driving causes many traffic accidents. (同上)
Many traffic accidents by careless driving.
4. Jack brings some friends to his party. (同上)
Some friends to Jack’s party.
5. People don’t use chopsticks in western countries. (同上)
Chopsticks in western countries.

II.1.were, used by 2.are planted 3.are caused 4.are brought 5.are not used

III. Fill in the blanks with the given verbs in their proper forms.
用括号内所给动词的适当形式填空，必要时可加助动词。
1. The letter (fold) and put in an envelope.
2. The rocks (shape) by sun, wind and rain.
3. If the soil (allow) to dry out, the tree will die.
4. His shoes (polish) every morning.
5. When the clay (fire) with soft woods, it turns dark from the smoke.
6. My birthday’s coming up and we are having a big (celebrate).

III.1.is folded 2.are shaped 3.is allowed 4.are polished 5.is fired 6.celebration