The widespread use of pesticides and herbicides has led to the _______of groundwater in many parts of the world.
A.corruption
B.contamination
C.poison
D.infection

_______for farming purposes, soil must contain the minerals plants require.
A.To be good
B.Be good
C.Being good
D.That's good

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

Find out a mistake

They told to him what to do.
A.told to
B.him
C.what
D.to

Pick out the word the underlined part of which is pronounced differently from the rest
A.phoned
B.raised
C.called
D.cooked

Choose the correct answer

……………………………….., she wouldn’t have failed the exam.

A.If Lan studied hard
B.Unless Lan had studied hard
C.If Lan had studied hard
D.If Lan studied hard

Choose the correct answer

He has been living in HCM city for years;…………..
A.so he knows it better than I
B.however, he knows it better than I.
C.therefore, he knows it better than I.
D.and he knows it better than I.

Choose the correct answer

The more studious she is, …………………………………….. .
A.the more happy her parents are
B.the more happier her parents are
C.the happier her parents are
D.the happiest her parents are

Find out a mistake

At first we found it difficult to get used to drive on the other side of the road.
A.at first
B.difficult
C.to drive
D.other side

Choose the correct answer

“What do you do?” “…………………”
A.I’m a typist.
B.I’m typing a letter.
C.I’m type a letter.
D.I typing letters