According to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.
A. increased B. had increased
C. had been increased D. was increasing
When the news came that China’s football team ranked ________ 2nd and qualified itself for ________ 2nd round, we all jumped up with excitement.
A. the; the B. the; a C. /; the D. a; /
It is reported that more than half of ________ surveyed on the website say they are content with their current life.
A. whom B. them C. ones D. those
The classical Chinese folk music ________ a wave of homesickness among the overseas students.
A. set out B. set off
C. set about D. set on
The handicrafts, ________ had been made by the students, were sold out soon.
A. most of which B. most of what
C. most of them D. most of whom
Each application letter should be ________ by a stamped and addressed envelope, so that we can reply to you in time.
A. stored B. bought C. kept D. accompanied
