下列各句中，表达得体的一句是

George returned after the war, only _______ that hiswife had left him.

Whenever I go past the office, I find him________ on the computer.

David, when do you get up every day—I usually get up _______half past six. I’m never late for school.

What are you going to give your mother for her birthday—I’m not sure. But I’ll buy her _______.