16. Our environment is seriously_________ .

       A. pollution                   B. polluted                       C. pollute                     D. pollutant

17. At this time yesterday, I ____________for my son’s birthday party.

A. prepared                           B. was prepared              C. was preparingD. were preparing

18. We went to school late because my alarm clock didn’t go________.

       A. on                               B. off                                 C. up                             D. of

19.  “What a lovely house you have!”                 – “___________”

       A. Thank you. Hope you will drop in           B. You’re welcome!

       C. Of course, it’s costly                                  D. No problem

20. Don’t criticize me. If you_____yourself in my position, you would behave the same.