These books______very interesting. Many children like reading them.
—What do you think of tomorrow’s football match? —_____difficult for us_____ the match.
You look quite tired. You’d better _____a good rest.
—How long have you _____the novel? —Three days.
—Listen!Helen is singing in the next room. —It _____be Helen .She has gone to Beijing.
Some people won’t realize the importance of their health _____they have lost it.