Ⅳ. Key structures. 关键句型。
A) Underline the model verbs should and could. Then complete the sentences with should or could. Do not refer to pages 16-17 until you finish your exercise.
画出课本16-17页情态动词should 和 could。然后用should 或 could 填空,完成练习后再对照课本,核对答案。
1. Thanks to the first aid and safety classes he took at school, he knew that water make oil fires much worse!
2. "Maybe we eat out tonight," James said as he ran cool water over his arm.
3. Sure, we do that. What do you want?
4. What start a fire at home?
5. What we do to keep ourselves safe from harm?

Ⅳ. 1. could 2. should 3. could 4. could 5. should