Never should we forget the war and sufferings _________ caused to the people.
| A．it. | B．which | C．that | D．what |
We waited and waited until the wind ____________ and then we started with our trip again.
| A．died away | B．died out | C．died down | D．died off |
The professor sort of dislikes the student, because he always asks some questions that have nothing to _______ his lessons.
| A．deal with | B．do with | C．connecting with | D．go with |
--- What did he say? ---- He said he ________ the sentence in his own words.
| A．was considering to explain | B．considered how to explaining |
| C．would consider to explain | D．was considering explaining |
I have no doubt in my mind______ they will be glad to see me.
| A．if | B．whether | C．that | D．about |
With the help of high technology, many new substances（物质）______in the past years.
| A．discovered | B．have discovered | C．had been discovered | D．have been discovered |