Usually computers________to search the Internet．
A．use
B．are using
C．are used
D．used
Tea was brought to Korea and Japan________the 6th and 7th centuries．
A．at
B．in
C．during
D．into
Our parents advised us________out alone at night because it was dangerous．
A．to go
B．not to go
C．going
D．don’t go
Shen Nong was the first to________tea as a drink．
A．discover
B．look for
C．find
D．find out
A lot of food________to that country after the war was over．
A．was sent
B．are sent
C．is sending
D．sent
Oh，this is really a big shop．Do you know when it________？
A．was built
B．built
C．has built
D．has been built
