My idea is different _________ yours, that is to say, I don’t allow _________ here．

from; smoking

in; smoking

of; to smoke

from; to smoke

_________ is generally accepted, economic growth is determined by the smooth development of the production．

What

That

It

As

_________ the population of the developing country?

How many are

How much is

What’s the number of

What is

It was about 500 years ago _________ the first clock with a face and an hour hand was made．

that

until

before

when

_________ the Olympic will be held in Beijing is known．

What

Whenever

What

When

_________ is at night _________ Tom is getting more and more quiet．

That; which

It; that

Whether; that

What; that

________ caused the great damage remains unknown．

What

That

How

Where

_________ Mr Smith is well again, he can go on with his work on time．

Now and then

Now that

The other day

Now just

The first use of atomic weapon(原子弹)was in 1945, and their power _________ increased ever since．

is

was

has been

had been

_________ two exams to worry about, I have to work really hard this week．

With

Besides

As for

Because of