Young people who have got jobs may realizecollege lessons can’t be the only preparations for all of the situation _______appears in the working world

May， is this your key ring—No， it’s not ______. It’s my sister’s.

下列各句中，加横线的成语使用恰当的一项是 （ ）

Why, David, you look so tired! –Well, I ______ a report for the whole day and I must finish it tomorrow

I’m very glad ______ you.