16. Mrs. Green went to Shanghai last week. She will be back _____five days.
A. at B. after C. on D. in
17. I hope your dream will _______.
A. come true B. come out C. come in D. come on
18. -- ______ does your school have a sports meeting? --Twice a year.
A. How far B. How long C. How often D. How soon
19. While Betty __________ a bike , she met Lily.
A. was rideing B. was riding C. rode D. riding
20. I was to see the police at my home yesterday.
A. surprised B. surprising C. interesting D. boring
21. ---My bag is style. ---Maybe you should buy a new one.
A. out of B. out for C. out from D. outside