Bài này thì có câu là thêm từ và có câu thì thêm từ và cả sắp xếp 1. If/ we/ recycle/ used/ materials/ we/ save/ nature 2. If/ he/ come, / I/ be/ surprised 3. If/ we/ wait/ here, /we/ be/ late 4. If/ I/ not/ go/ bed/ early/ I/ be/ tired/ tomorrow 5. She/ take/ a taxi/ if/ it/ rain 6. sea/ get warmer/ ice/ North and South Poles/ melt 7. ice/ North and South poles/ melt/ sea level/ rise 8. sea level/ rise/ flood/ many parts/ world/ people/ lose/ homes and lands 9. there/ floods/ many parts/ world/ people/ lose/ homes and lands 10. many people/ lose/ homes and lands/ live/ hunger and poverty ​