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A person , when_________，can often do what is normally beyond his ability.
#90324
A
challenged
B
challenges
C
challenging
D
to challenge
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That it keeps raining cats and dogs ________ the tourists.
#96130
A
worry
B
worried
C
worries
D
worrying
Cleaning women in big cities get _____ by the hour.
#93573
A
pay
B
paying
C
paid
D
to pay
Mr. Smith didn’t go to the party because he had a lot of experiments _____. 
#90778
A
do
B
did
C
done
D
to do
He is going to hospital _____________a medical examination next week．
#91161
A
togive
B
tobegiven
C
tohavegiven
D
tohavebeengiven
Don’t enter the office unless _______.
#97222
A
you have told to
B
told to
C
telling
D
you are told