Lin Kai, hand in your homework, please.—Oh, sorry. I ______ it at home this morning.

He was last seen _________in his office at about 7:15 p.m..

My father __________ free. He can’t play with me.

Never before ________ buying a computer, but now it seems a necessity in my everyday life.

John and I will celebrate our fortieth wedding anniversary next month. — Oh, ________!