When ________ the People's Republic of China ________?

A．was; found

B．was; founded

C．did; found

D．does; found

Man-made satellites ________ into space by many countries．

A．was sent up

B．is sent up

C．have been sent up

D．has been sent up

They ________ day and night．

A．are made work

B．are made to work

C．made to be worked

D．are making to work

When water ________, it will be changed into vapour．

A．is heated

B．heating

C．has heated

D．heats

The war ________ in 1941．

A．broke out

B．had been broken out

C．was broken out

D．had broken out

We can't use the bridge now, because it ________．

A．has been repaired

B．is repairing

C．is repaired

D．is being repaired

The picture ________ in October, 1996．

A．was taking

B．had been taken

C．was taken

D．had taken

Great changes ________ place．Many new schools ________．

A．have taken; have been opened

B．take; are open

C．are taken; open

D．have been taken; are opened

Rice ________ also ________ in their hometown．

A．is; grown

B．is; grew

C．was; grew

D．was; grown

The lab ________ about five years ago．

A．was builded

B．was built

C．builds

D．has been built