21.This doctor has spent more than a quarter century， bringing this new technology to _______________.
22.He lost his left leg _______________ a car accident.
A.in relation to
B.in connection with
C.as a result of
D.in case of
23.The arrival of the police brought an end _______________ the fight in the street.
24.I found my hometown had changed _______________ recognition when I visited it last year.
25.When we watched the clown performing， we could not _______________ laughing.
26.In the schools of ancient Greece and Rome， testing usually _______________ saying poetry aloud and giving speeches.
C.made up of
D.built up of
27.If you continue to put on weight， you will have to _______________ a diet before long.
28.They said the operation had been successful and they expected his father to _______________.
29.They will hold a concert next month in order to _______________ money for the disabled.
30.The control of the sand storms will ________________ a tremendous amount of work and money.