1 Choose the proper words or expressions to complete the sentences. 选出括号中恰当的单词或表达将句子补充完整。
(1) (Open/Close) the window, please. It's windy outside.
(2) Don't be (rude/shy). Come and join us at the party.
(3) (Wait a moment/Pack your pizza), please. Your pizza will be ready soon.
(4) Mum is having a break. (Keep quiet!/Stand up!)
(5) The floor is wet. (Be careful!/Be quick!)

1. (1)Close; (2)shy; (3)Wait a moment; (4)Keep quiet!; (5)Be careful!

2 Rewrite the sentences into imperative sentences. 将下列句子改为祈使句。
(1) You shouldn't laugh at your classmates. (Never)

(2) You mustn't take your pets into the swimming pool. (Don't)

(3) You should be honest with your friends. (Be)

(4) You mustn't park your car here. It's a no-parking area. (Don't)

2. (1)Never laugh at your classmates.
(2)Don't take your pets into the swimming pool.
(3)Be honest with your friends.
(4)Don't park your car here. It's a no-parking area.

3 Look at the signs in Riverside Park. What do they mean? Use different imperative sentences to describe them. 看河滨公园的标识，它们分别代表什么？用不同的祈使句描述标识。
(1) Don't smoke in public places./No smoking./Never smoke in the park./...


(2)


(3)

3. (1)Don't smoke in public places./No smoking./Never smoke in the park./...
(2)Keep off the grass./Don't step on the grass./Stop walking on the grass.
(3)No littering./Don't litter on the ground./Don't throw rubbish on the ground.