1.If people don't throw rubbish in the street then it would look attractive

2.If there aren't so many billboards in our city, we can enjoy the view

3.If there isn't so much light in the city at night, we can see the stars clearly

4.If we don't turn on the heater all the time, we won't have to pay 3 milion dong for electricity a month

5.If the karaoke bar doesn't make so much noise almost every night, the residents won't complain to its owner

6.If she doesn't work in a noisy office, she won't have a headache after work every day

7.If I had enough time, I can go on holiday this summer

8.If I know the answer, I can tell you

9.If they have a map, they won't get lost

IX-1.She felt unsafe

2.Because she thought that the power lines might fall down

4.She was so much stressed that she didn't want to study

5.She decided to clean the room

1. If the people throw rubbish in the street, the street won't look attractive.

2. If there are so many billboards in our city, people won't enjoy the view.

3. If there is so much light in the city , we won't see the stars clearly.

4. If we turn on the heater all the time, we will have to pay three million dong for electricity a month.

5. If the karaoke bar makes so much noise almost every night, the residents will complain to its owner.

6. If she works in a noisy office, she will has a headache after work every day.

7. If I don't have enough time, so I won;t go on holiday this summer.

8. If I know the answer, I will tell you.

9. If they have a map, they won't get lost.

( theo ý mình thôi nha). Chúc bạn học tốt.