This isn't _____ English book. It's ______.
— _______ will you stay in Shenzhen for your summer vacation?— For about two weeks.
— Must I return the book tomorrow?— No, you ________. You can keep it for three days.
Three fourths of the ________ in the country have run out.
I don’t know _________ the problem.
Hainan is a very good island. It’s the second ________ island in China.