16. Excuse me, ______ is the staff room? I want to speak to Miss Lily. because B. and C. while D. but 18. ________ do you go to school? - six days a week. A. How often B. How much C. How many D. How long 19. George didn't want to get up late, ____ he set the alarm clock to go off at 6.30. A. but B. and C. so D. for 20. Please _______ rubbish on the street! A. don't throw B. don't throwing C. not throw D. not to throw 21. Hong Kong is famous for ____ double-decker buses. A. Its B. It’s C. It D. It’s is 22_________ the programme is late, we will wait to watch it. A. because B. although C. when D. so 23. It was cold, so I_____ all of the windows. A. close B. closing C. closes D. closed 24. Last year, My brother _____ a new car. A. buy B. bought C. is buy D. are buy