—How do you deal with the disagreement between the company and the customers? —The key ___ the problem is to meet the demand ____ by the customers.
#97320
A
to solving; making
B
to solving; made
C
to solve; making
D
to solve; made
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We worked all night, _____ for the coming procession. 
#98012
A
to prepare
B
preparing
C
prepared
D
was preparing
If _______, I’ll show the committee what I have found out about the matter.
#94286
A
permitting
B
being permitted
C
permitted
D
having permitted
All these gifts must be mailed immediately__________ in time for Christmas.
#91658
A
in order to have received
B
in order to receive
C
so as to be received
D
so as to be receiving
We are invited to a party      in our club next Friday.
#91992
A
to be held
B
held
C
being held
D
holding