1. Because of the dangerous acid rain, trees' leaves are damaged(Because)

-> Because the acid rain is dangerous, trees' leaves are damaged.

2. I fail the exam because i don't study harder (if)

-> If I have studied harder, I wouln't fail the exam.

3. People took residents of the flooded villages to anh safe place last night (passive voice)

->residents of the flooded villagers was taken to anh safe place last night.

4.i'm not you , but i think you should recycle these plastic bags ( if)

-> If I were you, I would recycle these plastic bags.

5. Because his room is untidy , his mother í unhappy

-> because of his untidy room, his mother í unhappy.

1. Because the acid rain is dangerous, trees' leaves are damaged.

2. If I studied harder, I wouldn't fail the exam.

3. Residents of the flooded villagers were taken to the safe place last night.

4. If I were you. I would recycle these plastic bags.

5. Because of his undtidy room, his mother is unhappy.

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