The hungry dog went out ______ food.
-- ________ will you come back from the library, Linda? -- In an hour.
I _____ the newspaper while my mother _____ TV plays yesterday evening.
– Which dress do you prefer? -- The red one. It _______ more beautiful.
16-year-old students in England should understand fifteen _______ words.
– Must I stay here with you? -- No, you ______. You may go home, but you _____ go to the net bar(网吧).