He turned down the request of his friend because it was the limit of his power.
A．beyond B．over C．off D．above
After driving for five hours, they arrived at they thought was the place they had been dreaming of.
A．what B．that C．which D．where
If you had worked hard, you ______ so anxious now．
A．are not B．would not have been C．will not be D．would not be
_____ I'm willing to help, I do not have much time available．
A．While B．When C．Once D．Since
The rise of oil prices made scientists search for new energy resources ______ oil．
A．replace B．replacing C．to replace D．replaced
You didn't believe John won the first prize at the speech competition, ______?
A．did he B．didn't he C．did you D．didn't you
