–– ________ I come back before 6 o’clock?–– No, you _______ . But you ______ be back later than 7 o’clock.
_____ the Great Green Wall, the land produces (生产出) more crops.
—Where are Maria and Kangkang? —They _____ England.
—Do you know ______ ? —Sorry. I don't have a watch.
Mother is the person ______ is always there for you.
—Hey, Molly. You ______ on the phone just now. —Oh, I was in the library.