--Do you have any plans for this summer vacation?--I'm not sure. I ___ take a trip to Taiwan.
— _______ 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.