Đặt các động từ ở dạng đúng sử dụng thì quá khứ đơn.
13. Mozart (write) ....more than 600 pieces of music.
14. I (be) .... tired when I came home.
15. The bed was very comfortable so they (sleep) .... very well.
16. Jamie passed the exam because he (study) ....very hard.