What I want to know is ________ the price of oil is still rising．

A．when

B．how

C．why

D．that

After getting the visa, I was still very nervous as I didn't know what ________．

A．to be expected

B．to expect

C．expecting

D．to be expecting

His quarrel with his boss ________ him his job．

A．took

B．cost

C．spent

D．saved

Food safety is ________ important, so the government spares no efforts to prevent food pollution．

A．frequently

B．reasonably

C．highly

D．naturally

How long do you think it will be ________ China becomes a rich and harmonious country?

A．before

B．after

C．since

D．when

Cheer up! Everyone may have periods in their lives ________ everything seems tough．

A．which

B．where

C．when

D．that

_________ piano is her main focus, she's also great at guitar．

A．Since

B．Once

C．Unless

D．While

With the nuclear crisis worsening in Iran, the world's attention is fixed again on ________ is called the Middle East．

A．which

B．that

C．what

D．it

William found it increasingly difficult to read, for his eyesight was beginning to ________．

A．disappear

B．fall

C．fail

D．damage

Studying abroad costs so much money that it is ________ the reach of those with average income．

A．below

B．over

C．within

D．beyond