The poor young man is ready to accept ________ help he can get. 
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A
whichever
B
however
C
whatever
D
whenever
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To succeed in doing an experiment,________.
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A
carefulness is needed
B
carefulness is one needs
C
one needs to be careful
D
one need be careful
The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
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A
to be invented
B
having been invented
C
invented
D
to have been invented
The old couple married for 40 years and never once____ with each other. 
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A
they had quarreled.
B
they have quarreled
C
have they quarreled
D
had they quarreled.