The professor has received the letter ____ to give a lecture in frication Institute.
#98711
A
being invited
B
to be invited
C
inviting him
D
invited
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If you are not satisfied with the price _______, we can still discuss it.
#96224
A
being offered
B
to offer   
C
offering
D
offered
 The stranger ______ that he had walked into the reception room without anybody ______ him to. 
#97364
A
admitted; permitting
B
recognized; allowing
C
said; permission
D
admitted; admitting
You can’t imagine what great trouble they have _________ the problem_______.
#95579
A
to solve; being talked about
B
solving; discussing
C
to solve; to talk about
D
solving; being discussed