4. Because of his carelessness in learning, he usually gets bad marks.

5. Anyone who understands this book is intelligent than me. 

6. Although it rained a lot, we enjoyed the vacation.

7. The meal which cook by my sister was delicious.

8. If she doesn't help, we can't do our work more effectively.

9. It's two years from the last time Thuy met her old friends.

10. Most of the earthquakes in the world occur in the Ring of Fire.

Cho mình xin 5* và ctlhn nha :)))

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4. Because of not being a careful learner, my brother usually gets bad marks.
5. Anyone who understands this book is more intelligent than I am.
6. Although it rained a lot, we enjoyed the vacation.
7. The meal which my sister cooked was delicious.
8. If she didn't help us, we couldn't do our work more effectively.
9. It's two years since Thuy last met her old friends.
10. Most of the earthquakes in the world occur in the Ring of Fire.