－Must I go and get some water now?   －No, you __________.

— __________ we leave the library before 5 o’clock?— No, you needn’t. You can stay here until 5:30. 

Tom has grown      enough to take care of      .

—Can I pay the bill by check?     —Sorry, sir. But it is the management rules of hotel that payment _____ be made in cash.

If you ___ stick to the unrealistic approach, the worse result will be waiting for you not far ahead.