----It’s traditional in China to firecrackers on Spring Festival.
----But the serious smog（雾霾）nowadays needs us to stop it.
| A．give out | B．set off |
| C．put off | D．show off |
Pollution is a serious problem. Scientists have to _____ some good ways to save it.
A. come up withB. come on C. come out
You shouldn’t ________ your hope. Everything will be better.
A. give up B. fix up C. cheer up
_____Daming’s help , they solved the problems successfully .
A.As for B.Thanks for C.Thanks to
The driver saw an old man _______ on the side of the road .
A.lie B.lay C.lying
Bob used to __in the countryside . But now he is used to ____in the big city .
A.live ; live
B.live; living
C. living ; living