Jack, what about ______ to the zoo

We have been on duty for four hours and ＿＿＿＿.

, you seem to be a little absent-minded What’swrong—Oh, sorry Actually, Iofthe family party this weekend I have to make a list of what needs to bebought

Giving up smoking is a slow and painful _______ for him.

下列各句中，加横线的成语使用恰当的一项是（ ）