The volunteers kept their hands in hot water __________ they could no longer tolerate the pain.
A. unless B. until
C. when D. after
By the 10 century, Old English __________ the official language of English.
A. has become B. became
C. had become D. would become
Recently, we have experienced __________ problems about the school computers, such as slow speed of the Internet.
A. constant B. commercial
C. contrary D. chief
One study shows __________ while our sense of sight is used too much, our senses of touch and smell have been ignored.
A. whether B. what
C. if D. that
If we can convince young people not to start to smoke, they may __________ that everyone around them give up smoking too.
A. persuade B. urge
C. ban D. educate
The thousand-year-old temples have survived modernization and centuries of wind and rain, and the original buildings __________ now.
A. remain B. are remained
C. are remaining D. have been remained
