---Which sign can’t be seen on the road? ---_____.
A. 
B. 
C. 
--- Look, the factory is pouring waste water into the river.
--- That’s terrible! Why not _____ them _____ that?
A. keep; doing
B.to keep; to do
C.stop; doing
--- Work hard,_____ you won’t do well in your lessons. --- OK. I will.
A. and B.so C. or
---I’m not sure_____ Mr. Wang goes to see his parents ---Twice a week.
A. how long B. how often C. how soon
You _____ arrive at 6:00 a.m., but you arrived at 7:00a.m. last Sunday. Don’t be late this time.
A. supposed to
B.were supposed to
C. are supposed to
_____spending our vacation in a hotel,why not try hiking in the country?
A. Instead of B. Becaues of C. Thanks to
