15.Q13: If you ________noise pollution for a long time, you can have headaches and hearing loss.(4 Points)

1. experience
2. will experience
3. experienced
4. can experience

16.Q14: If there ____________fewer cars on the road, there would be less noise pollution.(4 Points)

1. is
2. are
3. be
4. were

17.Q15: Many aquatic animals die___________the polluted water.(4 Points)

1. because
2. due to
3. because of
4. Both B & C

18.Q16: ___________there was a lot of acid rain, many botanical species died last year.(4 Points)

1. Since
2. Cause
3. Although
4. So

19.Q17: We________pay so much money for electricity a month if we____________the air conditioner all the time.(4 Points)

1. wouldn't have to/ don't turn on
2. wouldn't have not to/ didn't turn on
3. wouldn't had to/ didn't turn on
4. wouldn't have to/ didn't turn on

20.Q18: Choose the best answer that is closest in meaning to the root sentences ( 18,19,20,21) I don't have enough money, so I don't buy seafood.(4 Points)

1. If I have enough money, I will buy seafood.
2. If I had enough money, I would buy seafood.
3. If I didn't have enough money, I didn't buy seafood
4. If I didn't have enough money, I would buy seafood

21.Q19: I don't live with my mother, so that I can't take care of her.(4 Points)

1. I can't take care of my mother because of I don't live with her.
2. Since I don't live with my mother, I can't take care of her.
3. Because not living with my mother so I can't take care of her.
4. Because not live with my mother, I can't take care of her.

22.Q20: I can't buy this house because it is quite expensive.(4 Points)

1. If this house is quite expensive, I can buy it.
2. If this house is not quite cheap, I will buy it.
3. If this house wasn't quite expensive, I couldn't buy it.
4. None is correct

23.Q21: I wrote a letter to my neighbors because they littered near my house.(4 Points)

1. Because of littering near my house, I wrote a letter to my neighbors
2. Because of littering near my house, my neighbors wrote me a letter.
3. Since littering near my house, I wrote a letter to my neighbors
4. I wrote a letter to my neighbors due to the fact that they littered near my house.