You’ll fail the exam _____ you work hard.

The number of the classes in our school is _______ than _______ of any other school in Wuxi.

(2013·吉林长春三校高三调研)Days later, I tried to get my sister to tell me what was going on, but she ________ say anything.

With more forests being destroyed, huge quantities of good earth____ each year. [ ]

It was dangerous for you to swim in that river. You eaten by the fish. [ ]