Not until _____,_______the diffiult problem.

______known to us,_______ increasing number of students are buried in their studies.

Exercise is _______ as any other to lose unwanted weight.

He stayed up too late every night,______ to catch up with his classmates.

With a good ______ of both Chinese and English,she had an advantage over the other interviewees.

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

Ladies and gentlemen,please fasten your seat belts,the plane______.

—What did he want to know,Anne?

—_______I could finish writing the report.

As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.

The last thirty years _____ the greatest number of laws stopping our rights and progress,until today we have reached a stage ____ we have almost no rights at all.