—Must I return the book this week?— No, you ____. You can ____ it for 20 days.

 He _____ have gone to Shanghai, for I saw him a moment ago.

---Can I tell Peter about the news?---No, I don’t want anyone else to know it. You ______ keep it to yourself.

 "______ I borrow your bike?"   "Sure. Here you are."

–Is there an express to Beijing tonight? -- There ______be , but you’d better call the booking office to make sure.’