Ghép các câu trong mỗi cặp thành một câu mới thể hiện mối quan hệ nguyên nhân / kết quả. Sử dụng từ hoặc cụm từ tín hiệu nguyên nhân và kết quả cho trong ngoặc.
9. Acid rain is dangerous, which makes trees' leaves damaged.
Trees' leaves are dangerous, which is due to the fact that acid rain is dangerous.
Acid rain is dangerous, so trees' leaves are damaged.
Trees' leaves are damaged because acid rain is dangerous.
10. We can't see the stars at night since there is too much light pollution.
There is too much light pollution so we can't see the stars at night.
Too much light pollution leads to our not seeing the stars at night.
We can't see the stars at night due to too much light pollution.
12. Households dump waste into the river so it is polluted.
The river is polluted because of the fact that households dump waste into it.
Households dumping waste into the river leads to its being polluted.
The river is polluted since households dump waste into it.
