1. Lan plays the violon in the school’s orchestra.

=>Lan plays the violon at the school’s orchestra.

2. The magazines on this rack is in English.

=>The magazines on this rack are in English.

3. After the first two lessons we have a twenty- minutes break.

=>After the first two lessons we have a twenty- minute break.

4. After our vacation in Ha Long Bay we returned to home by bus.(bỏ to)

=>After our vacation in Ha Long Bay we returned home by bus.

5. We are happy hearing that you’ve passed the final exams.

=>We are happy to hear that you’ve passed the final exams.

6. How many times in a day do you brush your teeth?(bỏ in)

=> How many times a day do you brush your teeth?

7. The dirt on vegetables can cause you sick.

=>The dirt on vegetables can make you sick.

8. She bought some souvernirs from the shop and so was I.

=>She bought some souvernirs from the shop and so did I.

9. Scientists say that the life started in the ocean.(bỏ the)

=>Scientists say that life started in ocean.

10. Indonesia is one of the strongest country in badminton.

=>Indonesia is one of the strongest countries in badminton.