根据短文内容，从各题所给的四个选项中选择一个最佳答案．

This story happened during World War I．A soldier（士兵）saw his friend fall in a（ 21） 　　with enemies．With the gunfire flying （22） 　　the soldier's head，the situation was dangerous．

"Captain（上尉），please allow me to get my fallen friend back．"

"You can go，"said the captain，"（23） 　　I don't think it will be worth it．Your friend is probably dead and you may （24） 　　your own life．"

But the soldier didn't listen to the captain and went anyway．

Luckily，he （25） 　　to reach his friend and carried him back to their trench（战壕）．The captain checked the wounded soldier，and then looked kindly at （26） 　　friend．

"I told you it wouldn't be worth it，"he said，"your friend is dead，and you are （27） 　　wounded．"

"It was worth it，though，sir．"The soldier said．

"Why do you think so？"Asked the captain in （28）． 　　"Your friend is dead！"

"Yes，sir，"the soldier answered，"but it was worth it because when I got to him，he was still alive，and I was（29） 　　when I heard him say，

'Jim，I knew you would come'．"

Many a time in life，whether a thing is worth doing or not really depends on （30） 　　you look at it．

Try to be brave enough and do something your heart tells you to do，or you may regret not doing it later in life．

21．A．discussion	B．journey	C．research	D．fight
22．A．over	B．from	C．through	D．in
23．A．and	B．or	C．but	D．so
24．A．clear out	B．cheer up	C．turn down	D．throw away
25．A．expected	B．managed	C，decided	D．refused
26．A．their	B．his	C．our	D．your
27．A．seriously	B．bravely	C．actively	D．hardly
28．A．silence	B．trouble	C．surprise	D．excitement
29．A．satisfied	B．angry	C．afraid	D．interested
30．A．when	B．why	C．where	D．how