Exercise 1: Hãy sử dụng thì quá khứ đơn cho mỗi động từ trong ngoặc đơn. Example: They worked hard yesterday. 1. They (cancel) the baseball game last week. 2. How you (get) there? I (take) a taxi. 3. They (not write) to me two years ago. 4. I last (meet) them when I (be) there. 5. They (watch) TV all day, so they (not finish) painting the wall. 6. John has worked for the company since he (give up) working in Ho Chi Minh City. 7. The children (sleep) well last night. 8. He (not teach) me how to use the machine. 9. They (speak) to him last night. They (approve) of his plans. 10. He (admit) having left the door open last night.