It was _______ great fun to be a host, wasn’t?－Yes. That’s _______ experience hard to forget.

I don’t know when my son back, but when he back, I’ll call you.

Lisa, we need to clean the kitchen. Could you _________ the trash?— Yes, sure.

Could you please give this message to Mr. White?— Sorry, I can’t. He doesn’t work here _____.[ ]

The doctor told him that he should take a holiday to relax himself, but _________ didn’t help.