With the help of high technology, more and more new substances ________ in the past years．

discovered

have discovered

had been discovered

have been discovered

When you get the paper back, pay special attention to what ________．

have marked

have been marked

had marked

had been marked

The country has already sent up three unmanned spacecraft, the most recent ________ at the end of last March．

has been launched

having been launched

being launched

to be launched

I got caught in the rain and my suit ________．

has ruined

had ruined

has been ruined

had been ruined

Professor James will give us a lecture on the Western culture, but when and where ________ yet．

hasn’t been decided

haven’t decided

isn’t being decided

aren’t decided

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

had discovered

had been discovered

has discovered

has been discovered

We should work hard to ________ our loss．

make up

make up to

make up for

make out of

There was a terrible noise ________ the sudden burst of light．

followed

being followed

to be followed

following

You are standing too near the camera．Can you move ________?

a bit far

a little farther

a bit of farther

a little far

They were all very tired．But ________ of them would stop to take a rest．

any

some

none

neither