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29．Over 20 countries joined to search _________ Flight MH370 in the southern Indian Ocean.
A) of B) for C) in D) from
30．Although advertisements enable _________ to make decisions
quickly, they sometimes cause lots of trouble.
A) we B) our C) us D) ours
31．--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
32．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
33．For the safety, everyone _________ obey the traffic rules when
he is driving or walking.
A) need B) must C) may D) could
34．I’d like to travel by air _________ it usually costs a lot of money.
A) so B) though C) until D) or 35．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
36．In recent years the environmental pollution has been _________ than before.
A) so serious B) serious C) more serious D) too serious
37．To live a green life, we try_________ more energy and produce
less pollution.
A) to save B) save C) saves
D) saved
38．Mr. White spent about one hour and a half _________ the accident
report yesterday evening.
A) write B) written C) writing
D) to write
39．At the meeting the boss was explaining his plan while his
secretary_________ the notes.