10. Have you locked the door?
11. I can not leave because I have not finished the work.
12. He wrote a letter, but could not find a stamp.
13. Here are your shoes. I just cleaned them up.
14. I left home at 8 and arrived here at 12.00.
15. Have you been here before? - Yes, I spent my vacation here last year.
16. Did you hear? Suzanne got married.
17. I have never played golf.
18. He smoked twenty cigarettes today.
19. Tom lost the key yesterday.
20. You saw this movie on TV yesterday.