9.
1. spend more
2. plays more
3. eat less
4. take in more
5. eat less; exercise more
6. take in more
7. spend more
8. pay more
9. drink less/ take in more
10. take in less
11. put on more/
12. go out less

bai 10:
1. studies => study
2. less => more
3. less => more
4. Don't => bỏ đi
5. Don't => bỏ đi
6. more => less
7. more => less
8. less => more

Bai 13:
2. i hate cats but i love dogs.
3. my brother is 20 years old but he likes watching cartoons.
4. there isn't anything in the fridge so i will go shopping
5. all the students have to finish the homework or the teacher punishes them.
6. james has many books but he rarely reads books.
7. my uncle suffer from diabetes so he stop eating sugar.
8. she needs new clothes but she doesn't have money
9. right now my mother is feeding the baby and my father is doing the housework.
10. my grandmother misses me and my brother so we will visit her this summer.