They ________ us to help us with the work．

promised

allowed

agreed

permitted

________ the development of the Internet, it has been an important part in our life．

When

As

At

With

There are several ________ students in my school．

thousands

thousand

thousands of

thousand of

________ is the percentage of ________ teachers in your school?

Which; man

What; men

How much; women

How many; women

The reason ________ his illness is that he has been too tired．

as

with

for

why

Poets often compare children ________ fresh flowers．

to

with

as

for

We all think ________ our duty to tidy the lab after the experiment．

this

that

/

it

We don’t allow ________ in the meeting room．

smoking

to smoke

to smoking

you smoke

I saw a woman running toward me in the dark．Before I could recognize who she was, she had run back in the direction ________ she had come．

of which

by which

in which

from which

Either Tom or Peter taking one exam after _______ another．

hate

hates

to hate

hating