There is a common belief among the students in our school ______ they should make great efforts to learn and reach the peak of their academic performances.

Not until he retired from teaching three years ago       having a holiday abroad.

No sooner______ themselves in their seats in the hall than the speaker began his speech.

He left home in 1980 and has never come back ____. 

______a mobile phone can you ring _______you want to talk with anywhere.