【题目】-- It’s dangerous to walk across the street carelessly.

【题目】 When the boy walks _______ the table ， he often knocks the things _______ it.

【题目】How can we (阻止) air pollution?

【题目】We must be strict __________ourselves __________ our work.

【题目】At the meeting，Mr. Wang began with a short (介绍).

【题目】If people know more about pollution(污染), _______ they will do something ______.

【题目】People shouldn’t keep ________ animals.

【题目】 I know Maths is not _______ Chinese.

【题目】She doesn't like b__________________.(花椰菜)

【题目】Sam spends _______time _______CDs than David.