1. The development of this local which can bring about more jobs for local people and more revenue for the region attraction should be invested in more.

2. This English course that focuses on developing communicative skills is very helpful for me

3. If he is not at the library now, he might reading books in the backyard of the school.

4. Lack of practice is the reason why I didn't pass the exam

5, If there are too many vehicles in the street, our planet will be severely polluted

6. The last time I went to Sapa when the weather then was beautiful was in May

7. Bạn xem lại đề

8. is → are.

1.The development of this local attraction should be invested in more. This development can bring about more jobs for local people and more revenue for the region. (which)

The development of this local which can bring about more jobs for local people and more revenue for the region attraction should be invested in more.

2.This English course is very helpful for me. The course focuses on developing communicative skills. (that)

This English course that focuses on developing communicative skills is very helpful for me

3. If he is not at the library now, there is a possibility that he is reading books in the backyard of the school. (might)

If he is not at the library now, he might reading books in the backyard of the school.

4.I didn’t pass the exam. Lack of practice is the reason for that.

Lack of practice is the reason why I didn't pass the exam

5,There are too many vehicles in the street. As a result, our planet is severely polluted.

If there are too many vehicles in the street, our planet will be severely polluted

6.The last time I went to Sapa was in May. The weather then was beautiful.

The last time I went to Sapa when the weather then was beautiful was in May

7.He has to get the IELTS certificate, so he has to go to this IELTS class.

If it were not IELTS certificate, he would not have to go to this IELTS class.

8.Carrots that provide a lot of vitamin A is good for eyes. 

is → are.