19. we found it a good idea ________ to the beach for a holiday.
a. of going b.to go c.but go d.except to go
20.________ the exact information, the researchers have been doing the experiments again and again.
a.to get b. to have got c.to be getting d.get
21.we were very _________ the invitation.
a.surprised;to receive b surprising; to receive
c.surprising; to have received d.surprised; to have received
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