The one pleasure that Einstein()his great fame was the ability it gave him to help others.
A. resulted from
B. stirred up
C. turned out
D. derived from
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Universal peace would be()to all mankind.
A. beneficial
B. valid
C. advisable
D. worthy
大量的秸秆燃烧也是造成雾霾天气的重要原因之一。()
The present difficulties()from our failure to deal with the problem when it first arose.
A. step
B. stem
C. steer
D. sponsor
We have not()information to state the exact damage.
A. abundant
B. sufficient
C. plenty
D. efficient