In____review of 44 studies, American researchers found that men and women ____who ate six key foods daily cut the risk of ______ heart disease by 76%.  

A. a; the         B. the; a         C. a; 不填        D. 不填； a  

__________ the silence for the pauses, we could hear each other’s breathing and could almost bear our own heartbeats.

A. In            B. For            C. Under            D. Between

There are not enough seats for the guests. We need _____ chairs.

    A. three other             B. another three      

  C. more three             D. other three

--- Where can we have supper tonight?

    --- Oh, if you don’t mind,we can do it at _____ of the restaurants.  

    A. all           B. every          C. any        D. each

A man does not know the difficulty of anything_________ he does it personally.

although     B. if            C. because       D. Unless

--Nancy is not coming tonight. --But she ___________ !

A. promises        B. promised   C. will promise     D. had promised

—What’s the area and population of the US？

—The US is about the same size as China, but its population is five times ______.

A. smaller  B as little.  C. as few   D. bigger.

—Why didn’t you tell him about the meeting?

—He rushed out of the room _____ I could say a word.

A. before            B. until                C. when           D. after

—Must I turn off the gas after cooking?

—Of course. You can never be ____ careful with that.

A. enough                B. too                     C. so                      D. very

What a table! I’ve never seen such a thing before .It is________  it is long.

A．half not as wide as                               B．wide not as half as

C．not half as wide as                               D．as wide as not half