1 . He did not __________ (犹豫) for a minute to save the drowning child. (根据汉语提示单词拼写）

2 . After pains-taking efforts, he eventually concluded that the principle he stuck _______ true.

A．to proved	B．to proving
C．to be proved	D．to being proved

3 . If he continues like this, he will _________ a stone only to have it drop on his own foot, just as the old saying goes.

A．end up to lift	B．end up lifting
C．end up in lifting	D．end up with lifting