11. The weather is fine enough for us … camping. A. to go B. going C. go D. be going 12.We have lived in Nha Trang …………………..2015. A. in B. for C. from D. since 13. She always tries her best to study ........................ please her parents. A. in order B. in order to C. so as in D. so that 14. He had his father..................... his watch A. fixed B. fixing C. to fix D. fix 15.….……………….. have you studied English? ~ For 3 years. A. How long B. How much C. How often D. How many 16.Motorbikes _______________ in China are cheap. A. make B. made C. makes D. making 17. She hasn’t finished the letter__________. A. already B. just C. yet D. never 18. Would you like some orange juice ? - ……………………………. A. Sorry, but I can’t. B. Yes, I would. C. No, I wouldn’t. D. No, thanks. 19. It is difficult _______________ all these things. A.to remember B. remembering C. remember D. remembered 20. _______________ you mind if I smoked? A. Could B. Don’t C. Do D. Would