His timely warning was_____ help us avoid being cheated.

We were on the point of discussing financial investment_____ the telephone rang unexpectedly.

     you feel so terrible now, you may as well see the doctor quickly.

I am ashamed, sir, that I wasted the many hours __________ I should have studied in class.

— _________ was it _________ they discovered the entrance to the underground palace？
— Totally by chance.

Try the new cleaner. Just a few minutes every day－that’s all it takes－_________ you could have shining floors and furniture.

When solving the problem a second time, you’d better be more careful____you made a mistake.

It was not just the size of the party last night_________made it unique, but_____ it meant to our company.

Chinese netizens （网民） doubt ______they called Western freedom of speech , seeing the dishonest reports about the recent riots（暴乱） in Tibet by some Western media．

— The man is always behaving rudely.  
— That I guess is ________ people avoid him.