Thank you, Mr. Chen. I’m wondering how to ______ the great help you gave me during my study this year.

. ------- What do you think of Harry, our new roommate?
-------- I am not sure, but he is always asking ______ questions.
a great many of  B. a great many  C. a great number  D. a large amount of

News reports say peace talks between the two counties have________ with no agreement reached.

I want to ________ the secrets of nature and apply them for the happiness of man.

In their efforts to persuade us to buy that product, shopkeepers have made a close study of human nature and have_______ all our little weaknesses.

From facts, scientists have_______ that more energy is being absorbed from the sun, throwing the earth’s energy “out of balance”.

There ______ many people ______ in the office, but now nobody is allowed to.

I’m sure Xiaoxiao can ______ a lot of money doing this job and he can ______ a living with the money he earned himself.

The money collected from ticket sales could be ______ food and clothes for the people in the flooded areas.

In the ______ house the firefighters saved a lot of______ people, but they couldn’t be sent to hospital because of the______ road.