---What do you think of Jack?
---He is not a bad boy. ______, he’s a pretty good one.

_____ a mobile phone can you ring____ you want to talk with anywhere.

—Did you know any Chinese before you arrived in Beijing?
—Never ________ it, actually．

An awful accident_____，however，occur the other day.

_____， he often forgot to turn off the lights.

He was unable to make such progress, ____.

No sooner ____ they rushed out into the street.                 

---- David has made great progress recently.
---- ____, and ____.     

____, he would have passed the exam.

---- This store has such high prices.              
---- I agree. Never again ____ here.