1. was

2. was

3. was

4. were

5. were

6. was

7. was

8. was

9. was

10. was

Of the four participants, Bill is the least experienced

1. was

2. were

3. was

4. were

5. was

6. was

7. were

8. was

9. was

10. were .. was

11. were

12. were

13. was

14. was

15. were

16. was

17. did?

18. was

19. did?

20. was

Câu hỏi : When's your sister's birthday?

-> Answer : My sister's birthday is on the fourteenth of July.

-> Dịch : Sinh nhật của (em gái) chị tôi vào ngày 14 tháng 7

Cấu trúc : It's + on + the + [ordinal number] + of + [month].

B. was reading (có "while" là dấu hiệu nhận biết)

was sweeping (có "while" là dấu hiệu nhận biết)

"chỉ biggest thôi, đâu có từ person trong đề đâu :D"

-> dạ vâng ;-;

Em nghĩ phải có person chứ. Thường thường em làm toàn thế :vv

M sai câu 2 kìa. Câu 2 chỉ có biggest không đủ, sai ngữ pháp.

xuống đi ^^