The school headmaster forbids ________ in the office．

smoking

to smoke

us smoke

from smoking

We were listening closely to the lecture yesterday evening when suddenly the light ________．

had been gone out

was going out

was gone out

went out

________ the boss has arrived, let's begin our discussion right away．

If

When

Now that

Even if

The way ________ was thought of by him ________ the experiment was similar to the way ________ you carried it out．

that, doing, which

which, of doing, in which

what, to do,\

it, of doing, that

In some cases, different approaches ________ the same scientific problem lead to conflicting the theory．

to

of

in

for

New technology was used in teaching．As a result, not only ________, but students became more interested in lessons．

saved was teachers' energy

was teachers' energy saved

teachers' energy was saved

was saved teachers' energy

Green products are becoming more and more popular because they are environmentally ________．

friendly

transparent

best-selling

widespread

Yesterday, Project Hope got a large amount of money from one company and it ________ to build 300 schools in poor rural regions over three years．

has been used

was used

will be used

had been used

No matter how ________ praised, you should always remember never to stop improving yourself．

frequently

generally

normally

commomly

I prefer a flat in the downtown area to ________ in the suburb, for I want to live near my school．

one

that

it

this