Can you explain ________ having done such a thing?

[    ]

A. me the reason for　　 B. me the reason why

C. the reason on me why  D. the reason to me for

Can you give us ________to have a meeting in?

[　　]

A．an enough big room

B．a room enough big

C．a room big enough

D．a big room enough

The thick smoke ________ it impossible for the helicopters ________ on the roof.

[    ]

A. make; land　　  B. making; landing 　　

C. made; to land   D. makes; the landing

________ good progress you are making!

[    ]

A. What   B. What a   C. How   D. How a

The light in the lab is still on.

Oh , let me go and ________.

[　　]

A．turn it down

B．turn it off

C．turn it over

D．turn it up

We all made him ________ of the workshop.

[    ]

A. head   B. the head   C. a head   D. to be head

The invention of paper made ________ possible for the country to keep records about its history.

[    ]

A. this   B. that   C. it   D. one

The soldier stood in front of the gate, ________ a gun ________ his hands.

[    ]

A. use, by   B. using, by   C. with, in   D. with, on

He is an old worker. He ________ until he was over sixty.

[    ]

A. didn't begin to work   B. stopped working

C. kept on working　　    D. didn't stop to work

The books ________ silk were more expensive than the books ________ paper.

[    ]

A. made of; made of　　  B. made of; made from

C. made from; made from  D. made from; made of