下列各句中，没有语病的一句是(　　)

I don’t understand_________. —I’m sorry. But I was doing my homework at that time.

All the Chinese were _______ when they heard Liu Xiang won the first. It was really _______.

He told me that he wanted to date with you and he would be free on Friday and Saturday.Will Friday or Saturday________you?-Either will________[ ]

We promise that we will never forget the human _______. We all love to live in peace.