----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.
| A． must have | B．could have | C．should have | D．might have |
Eastern areas have ________ too many wars in the past fifty years.
| A．gone through | B．got through | C．looked through | D．lived through |
A U.N. peace-keeping _______ was sent to that country and the soldiers would devote all their _______ to their job.
| A．power; energy | B．power; strength | C．force; energy | D．force; strength |
The book is primarily ___________ Soviet-American relations during the Cold War.
| A．concerned about | B．concerned with | C．concerned for | D．concerned in |
Each girl present at the party was wearing a flower in the hair, which _______ their beauty.
| A．added | B．added up | C．added to | D．added up to |
He decided to _________ the club for old men and play chess there.
| A．take part in | B．join in | C．attend | D．join |