A good lecturer should be ready for situations where he finds himself in front of the crowd and has questions_____ at him, back on the shelf.
A.threw
B.thrown
C.to throw
D.throwing

There are thousands _______leopards in the world than tigers.
A.
B.of
C.about
D.more

Butterflies have______ larger wings than bees.
A.few
B.less
C.some
D.considerably

Some fresh herbs can greatly change the way food_____
A.smell
B.smelly
C.smells
D.has smell

It always _____time to settle down at a new place.
A.saves
B.takes
C.spends
D.cost

Gardeners will mow the lawn _____you tell them not to.
A.because
B.when
C.if
D.unless

The environmental impact of tourism can be shocking and upsetting, but many governments think it is______
A.acceptable
B.bad
C.comprehensive
D.negative

From the first paragraph, we know How-to books are_______________.
A.only about four thousands copies.
B.on money.
C.very helpful in life.
D.needed a lot.

The passage tells us that How-to books sell well on how _____________.
A.to succeed in career.
B.to solve personal problems.
C.to solve personal problems.
D.to make money

How-to books appear only because_______
A.people have more free time to spend than before
B.people meet more problems than their parents.
C.people meet more problems than their parents.
D.modern life is more difficult to deal with.