Are the books ________? — No, they belong to ________.

I called you at nine this morning, but there was no answer.— Oh, sorry, I ______ with my sister in the shopping center.

____ you sing the English song?— Yes, I can.

My pen pal said he would write to me, but I _____ any letters from him so far.

Jim has three hamburgers _____ lunch.[ ]