This painting is so valuable that it is rather difficult to calculate _______ its price would be if the museum _______ to sell it.

He worked hard before the college entrance examination, and it _______. His dream to go to college came true.[ ]

The expression on his face suggests he ________ have failed in the competition.—I guess so. It’s not easy after all.

I can’t learn English well. What can I do, Mr. Smith— Tom, ________ is difficult if you work hard.

Thousands of people______ after thepowerful earthquake happened in Wenchuan on May 12th.