I / Choose A, B, C or D to complete the following sentences
11. I will be ____ if she manages to sell that motorbike at a high price
A. surprise B. surprised C. surprising D. to surprise
12. Unless you understand, I ____ explain it again to you
A. am B. was C. will D. would
13. If you know where she lives, please let me ____
A. know B. knew C. known D. to know
14. Don’t talk in class, ____ you? The teacher is explaining the lesson
A. do B. don’t C. will D. won’t
15. He laughs a lot because _____ her funny face
A. in B. at C. on D. of
16. I remember _____ her somewhere
A. see B. seeing C. saw D. to see
17. Excuse me. Can I _____ in this area?
A. smoke B. smoking C. smoked D. to smoke
18. We don’t allow passengers _____ in this part of the building
A. smoke B. smoking C. smoked D. to smoke
19. Don’t forget _____ the letter for me! I won’t
A. post B. posted C. posting D. to post
20. He thinks that ____ on the Internet is a waste of time
A. chat B. chatting C. chatter D. to chat