22. We know a good deal about the people who lived in China 4, 000 years ago, because they ______write and leave written records for those who lived after them.
What would have happened____, as far as the river bank?
—— Will you stay for lunch? —— Sorry, _____. My brother is coming to see me.
—— Why do you make me do so? —— I am sorry that you________do such a thing.
—— Must I take a bus ? —— No, you____. You can walk from here.
—— I didn’t see her yesterday. —— Oh, but you _______________.