They ___ two free tickets to Canada, otherwise they’d never have been able to afford to go.
The professor sort of dislikes the student, because he always asks some questions that have nothing to _______ his lessons.
--- What did he say? ---- He said he ________ the sentence in his own words.
I have no doubt in my mind______ they will be glad to see me.
With the help of high technology, many new substances(物质)______in the past years.
---- Will Joe attend the party? ----- If his wife won’t go to the party,_________.