In our life, one question that ____ comes up is:“to be or not to be?”

Drunk driving used to occur _______, but now it is under control.  

After ten years abroad, he still recognized his old colleagues ________ he set foot in China．

_____, he together with his families ____ escaped from the shaking building when the earthquake struck Lushan County of Ya’an.

— So you missed the meeting．— ______. I got there five minutes before it finished.