They _________ have arrived at lunchtime but their flight was delayed.
A. will B. can
C. must D. should
China is one of the countries ________ the Mekong River flows.
A. in which B. by which
C. across which D. through which
He was _________by his colleagues though he himself didn’t think he had done anything special.
A. thought little of B. thought poorly
C. thought highly of D. thought highly
It was reported that a chemical factory________ last night, which killed thirty workers.
A. exploded B. cracked
C. ruined D. burst
The exhibition is well worth ________ and you can see fancy vases of different dynasties on show there.
A. to visit B.to be visited
C. being visited D. visiting
Only when he reached the tea-house _________ it was the same place he’d been in last year.
A. he realized B. he did realize
C. realized he D. did he realize
