I made the ________ that he was coming, so I was surprised when he didn't show up．

A．demand

B．enquiry

C．reservation

D．assumption

As these beautiful places attract lots of tourists, their protection comes under ________．

A．threat

B．control

C．repair

D．construction

People in many parts of the world are ________ for water, and more people will need more water in the next century．

A．desperate

B．prime

C．user-friendly

D．explicit

Money is a needful and precious thing, and when ________, a noble thing, but I never want you to think it is the first or only prize to strive for．

A．well used

B．well using

C．to well use

D．being well used

As a student, I love ________ when it snows and school is cancelled．

A．this

B．that

C．it

D．one

The murderer was ________ for almost a month before he was arrested in Hainan．

A．on the run

B．on the scene

C．on the air

D．on the decline

People who tend to focus on ________ while speaking a foreign language may find that they worry too much about making mistakes．

A．fluency

B．agency

C．policy

D．accuracy

However ________ certain natural resources may be, they cannot reproduce themselves and are surely to be used up eventually．

A．rigid

B．terminal

C．abundant

D．violent

Drinking water, which is ________ must for any human to survive, has to be stored based on ________ number of people in the household．

A．the; a

B．a; the

C．/; the

D．the; the

With China ________ in the world trade more frequently, the world economy is developing more rapidly and steadily．

A．participating

B．to participate

C．participated

D．being participated