________ regular exercise is very important, it's never a good idea to exercise too close to bedtime．

A．If

B．As

C．Although

D．Unless

Although that big earthquake did great ________ to this city, is was soon rebuilt from the ________．

A．damage; ruin

B．damages; ruin

C．damage; ruins

D．damages; ruins

Before ________ stood a terrible man; Linda could do nothing ________．

A．she; but cry

B．her; but cry

C．she; but to cry

D．her; butcrying

He is the only one of the student who ________ a winner of scholarship for three years．

A．is

B．are

C．have been

D．has been

As is known to all, ________ People's Republic of China is making great efforts to build ________ new China．

A．the; the

B．不填；the

C．the; 不填

D．the; a

Do you know the reason ________ quite a number of insects, birds and animals in this area are dying out?

A．which

B．that

C．why

D．when

I'd like to buy a house, modern, comfortable, and ________ in a quiet neighborhood．

A．after all

B．above all

C．in all

D．at all

Social attention should be paid ________ our earth from ________．

A．to preventing; being polluted

B．to prevent; polluting

C．to prevent; being polluted

D．to preventing; polluted

She ________ her tears, not letting others know what happened．

A．held up

B．held back

C．held on

D．held out

A reading room is ________ you can read newspapers and magazines as well as books．

A．in which

B．where

C．that

D．place