— _______ will you stay in Shenzhen for your summer vacation?
— For about two weeks.
A．How far B．How often C．How soon D．How long
— Must I return the book tomorrow?
— No, you ________. You can keep it for three days.
A．mustn’t B．needn’t C．can’t D．may not
Three fourths of the ________ in the country have run out.
A．water B．book C．forests D．news
I don’t know _________ the problem.
A．how deal with B．how to deal with
C．what to deal with D．what do with
Hainan is a very good island. It’s the second ________ island in China.
A．largest B．large C．larger D．most large
The accident happened ________ a cold winter morning.
A．in B．at C．of D．on
