I’d like to buy some books by Mo Yan.—Sorry, they out just now .

The sign near the river _________ “Don’t swim in the river.”

Is there anything else that I can do for you?–No, thanks. I am very ______ with what you’ve done for me.

We should do what we can ___ the endangered animals.—-Yes,it’s our duty them.

The population of China ___ than ___ of any other country in the world.