慧眼识字并组词。
票( ) 央( ) 求( ) 刀( )
漂( ) 英( ) 球( ) 力( )
邮票 中央 要求 大刀
漂亮 英雄 足球 力量(答案不唯一)
There is growing tendency among middle-school students___________they will do some voluntary work during their vacation.
A.which
B.why
C.how
D.that