I _____ such a mistake again.  

 He _____ not pay unless he is punished to pay.  

—_____ I water the trees on Tuesday?  
　 —No, you needn’t.  

—That must be a mistake.  
　 —No, it _____ a mistake.  

Global warming ________ cause huge climatic changes and possibly a new ice age.

Now, with a stronger economy, people ______ enjoy a better quality of life.

With his good sense of direction, he _____ quickly and easily get round in the new city.

Uncle Wang is a genius cook and we_____ never get enough of his cookies.

He ________ comb his hair at the table, even though he knows I don’t like it．

The young man has made so much noise that he          have been allowed to attend the concert.