Steps must be taken _________ this kind of disaster will never happen again.

Cindy shut the door heavily and burst into tears. No one in the office knew         she was so angry.

I've become good friends with several of the students in my school         I met in the English speech contest last year.

—Why are you staring at me?
—You look stupid! The way you wear is _______ annoys others most.

I have taken jogging for about an hour every morning as my daily routine   _______the weather.

________atmospheric haze(雾霾天气) or smog will continue makes the public worried.

—Are you guys ready for “The Campus Singers Competition”?
—Sure！Since we are young, try it, _____ we will regret!

Are you willing to live in an age _____ 4G technology will bring about an information revolution?