To live a green life, we try_________ more energy and produce less pollution.
A. to save B. save C. saves D. saved
In recent years the environmental pollution has been _________ than before.
A. so serious B. serious C. more serious D. too serious
．It is said that a wooden bridge_________ over the river in the mountain village soon.
A. build B. will be built C. will build D. built
I’d like to travel by air _________ it usually costs a lot of money.
A. so B. though C. until D. or
For the safety, everyone _________ obey the traffic rules when he is driving or walking.
A. need B. must C. may D. could
This summer vocation I am going to do a lot of _________ to prepare for the senior high school.
A. job B. work C. invention D. service
