12. Correct the mistakes:
1. Ko có lỗi sai.
2. Three-weeks → three-week
3. less → fewer
4. to do → doing
6. hapily → happy
7. plays → played
8. was → had
9. going → to go
10. looks at → looks after
13. Fill in the gap. Then answer the questions
1. before
2. to
3. when
4. back
5. too
6. we
7. both
8. had
9. of
10. because
Về phần trả lời câu hỏi thì mk ko biết nha, mong bạn thông cảm.
Chúc bạn học tốt.