46.The young man who saw the car ______ into the river telephoned the police station.
a. plunge b. plunged c. was plungingd. to plunge
47.While she was shopping, she kept ______ the list to make sure she hadn’t forgotten anything.
a. checked b. checkingc. to check d. check
48.You’d better ______.
a. to have your shoes mended b. to have mended your shoes
c. have your shoes mendedd. having your shoes mended
49.The machines are made ______ at full speed.
a. work b. workingc. to work d. to be worked
50.It is certain that men will never stop ______ new energy sources to power their growing industry.
a. findingb. to find c. having found d. found
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