If Newton lived today, he would be surprised by what ________ in science and technology．

had discovered

had been discovered

has discovered

has been discovered

I'm so glad to see you back, Lucy．How long ________ at your grandma's?

had you stayed

did you stay

have you stayed

would you stay

Problems relating to people's livelihood(民生)have been the focus of the government, especially ________ Premier Wen Jiabao included them in his government work report last year．

when

if

since

until

－I'm afraid these flowers won't be able to live through the winter．

－But I think otherwise．You see, measures ________ to take good care of them．

have taken

had been taken

will take

are being taken

Some people think that as more and more people have televisions in their homes, ________ people will buy books and newspapers．

more and more

any the less

more or less

fewer and fewer

________ fire, all exits must be kept clear．

In place of

Instead of

In case of

In spite of

You'll imagine what difficulty we had ________ home in the snowstorm．

walked

walk

to walk

walking

There is no experience you can have ________ is more exciting than skating on real ice．

of which

what

that

with whom

On the chairs ________, who had come to Dalian looking for jobs．

three young men sat

sat three young men

did three young men sit

three young men sitting

The young man didn't mean to ________ the house．He stole into it and made a fire only to get warm．

pull down

lay down

burn down

turn down