The telephone ________ four times in the last hour, and each time it ________ for my roommate．

has rung; was

has been ringing; is

had rung; was

rang; has been

Scientists say it may be five or six years ________ it is possible to test this medicine on human patients．

since

after

before

when

He is ________ the China Daily．

at

for

on

of

She can’t help ________ the house because she’s busy making a cake．

to clean

cleaning

cleaned

being cleaned

The teacher said“ ________ a great pity that some students don’t realize the value of time．”

This is

That is

There is

It is

The lady said she would buy a gift for her son with the ________．

20 dollars remained

20 dollars to remain

remained 20 dollars

remaining 20 dollars

A lot of countries have gained excellent achievements in space technology, China, ________．

such as

for example

namely

and so on

Everything has been done．It only ________ for them to come and enjoy the meal．

leaves

remains

appears

seems

The number of people present at the concert was ________ than expected．There were many tickets left．

much smaller

much more

much large

many more

Every time I come into his room, he ________ the same book．

read

was reading

readed

is reading