David likes country life and has decided to ________ farming．

A．go in for

B．go back on

C．go through with

D．go along with

In the meantime, the question facing business is whether such research is ________ the costs．

A．worth

B．worth of

C．worthy

D．worthwhile

When I said goodbye to her, she ________ the door．

A．saw me at

B．set me off

C．sent me to

D．showed me to

Today the public is much concerned about the way ________．

A．nature is being ruined

B．which nature is ruined

C．on which to ruin nature

D．of nature to be ruined

He thought he could talk Mr．Robinson ________ buying some expensive equipment．

A．on

B．of

C．round

D．into

The place is an ideal site for a university ________ it is far from the downtown area．

A．provided that

B．now that

C．so that

D．in that

________ I admit that there are problems, I don't' think that they cannot be solved．

A．Unless

B．Until

C．As

D．While

Iceland lies far north in the Atlantic, with its northern most tip actually ________ the Arctic Circle．

A．touched

B．touches

C．touching

D．being touched

It has been estimated(估计) that the earth's surface temperature has increased ________ sone quarter to three quarters of a degree since 1850．

A．to

B．by

C．at

D．with

Rebecca ________ me earlier if she did not like her house she bought last month．

A．told

B．would tell

C．had told

D．would have told