Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.

You can imagine what great tuouble we had_____ the school for the blind.

______ the hometown, he went back to company.

Do you know how much time and effort they devoted________ such a complicated project?  

English is difficult________. Nobody can learn to use it in a few minutes.

Tom took a taxi to the airport, only ________ his plane high up in the sky.

China’s hurdler Liu Xiang was disqualified due to false start in the 60-metre event, _____ his rival Dayron Robles of Cuba an easy win of 7.66 seconds.

When _____ a career, you’d better consider all the possible respects.

She was the first woman ______ to the board.

________with so much trouble，we failed to complete the task on time.

In April，thousands of holidaymakers remained________abroad due to the volcanic ash cloud.

“Things________never come again！” I couldn’t help talking to myself.

—Can those________at the back of the classroom hear me?—No problem.

You need some facts _____ to base your theory.

________ for not keeping his promise，Gary hung his head in shame.

It was ______ the president's speech that the secretary spent the whole morning at home.

Sarah pretended to be cheerful,            nothing about the argument.

________ in a red dress, she was easy to _______ in the big crowd.

Sometimes I’m dying ______ him about it.

Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.