Dùng từ gợi ý để viết thành câu hoàn chỉnh 1. He / not / know/ foreign language / made / it / difficult / him / get / well-paid job. 2. nowadays/ our lives / improved / much / progresses / science and technology// 3. air / many areas / so unclean that / people / have to / masks / going / streets 4. Air pollution / lead / greenhouse effect / make/ temperature / earth's surface / higher

=>

1. He didn't know a foreign language, which made it difficult for him to get a well-paid job.

-> which: đtqh chỉ vật/thay thế cả mệnh đề

2. Nowadays our lives have been much improved by the progresses made in science and technology.

-> bị động HTHT have/has been V3/ed

3. The air in many areas is so unclear that many people have to wear masks when going out on the streets.

-> so adj that: quá...đến nỗi

4. Air pollution leads to the greenhouse effect making the temperature of the earth's surface higher.

-> lead to: đẫn đến