About 60 percent of the students ________ from the south, the rest of them ________ from the north and foreign countries．

A．are; is

B．are; are

C．is; are

D．are

The news ________ us so much that all of us were ________ at it．

A．astonished; astonished

B．astonishing; astonishing

C．astonished; astonishing

D．astonishing; astonished

The key you have just got ________ the front door．

A．is used to opening

B．is used to be opened

C．is used to being opened

D．is used to open

Don't make fun of him again; he is no longer what he _________ be．

A．should

B．would

C．used to

D．was used to

As a child, he ________ often go to the seaside watching ships．

A．would

B．used to

C．should

D．is used to

She is shy．She is not used to ________ in front of others．

A．praise

B．praising

C．being praised

D．be praised

While you are walking on the wall, it's important to ________ your balance．

A．keep

B．break

C．lose

D．mind

We should try our best to keep ________ balance of ________ nature．

A．the; the

B．the;/

C．/;/

D．/; the

His father always keeps him ________, but he won't listen to him．

A．smoking

B．from smoking

C．to smoke

D．not to smoke

When you come to the fence, you can see a notice ________ there saying“________ the grass”．

A．putting up; Keep off

B．put up; Keep off

C．putting up; Keep away

D．put on; Keep out