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
--Did you see Mary and her sister this morning?
-- Yes, I saw _________ girls playing in the playground.
A. either B. neither C. any D. both
