He tried to quit smoking, ____ he found impossible.

A. as
B. where
C. which
D. when

The reason ____ I am calling you is to tell you a meeting on tomorrow morning.

A. because
B. why
C. as
D. which

____is known to us all is that the 2011 Universiade was held in Shenzhen.

A. What
B. As
C. Which
D. It

The manager realized ____ that was their only chance to defeat their rivals.

A. /
B. it
C. this
D. that

A modern school has sprung up in ____ was a fishing pond 10 years ago.

A. which
B. what
C. that
D. where

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Why did Chairman Mao Zedong call on the nation to learn from Lei Feng?Because Lei Feng was a hero representing ____________________________.

Why do some people regard Lei Feng’s spirit as being outdated?The reason is that these people ___________________ the significance of Lei Feng’s spirit.

What forms the basis of civilized society?

According to the passage, what is Lei Feng’s spirit?It is helping others for __________ and being content with ___________________________.