The word “microbes” in paragraph 3 could best be replaced by which of the following?
A.Pieces of dust
B.Tiny bubbles
C.Tiny organisms
D.Rays of light

In making remarks, he _______to understatement.
A.declined
B.intended
C.aligned
D.inclined

After her illness, Lam had to work hard to _______ his classmates.
A.catch sight of
B.keep pace with
C.get in touch with
D.make allowance for

Some kinds of birds are on the _______of extinction.
A.brink
B.tip
C.side
D.edge

_______of popular expressions in our language have interesting backgrounds.
A.A large number
B.The large number
C.A great deal
D.A sum

Please _______your cigarette. I am going to get choked.
A.cut down
B.blow out
C.put aside
D.put out

Since the reform, the country has undergone _______changes.
A.large
B.sizeable
C.substantial
D.favourable

A.environmental
B.conservatively
C.approximately
D.considerable

Research has shown that there is no difference at all between the brain of the average woman and _______of the average man.
A.what
B.which
C.one
D.that

- “That’s a very nice skirt you’re wearing.” -“ ___________”
A.How a compliment!
B.That’s all right.
C.It’s nice of you to say so
D.I like you said so.