When<br/>some fruits emit (),<br/>it causes other fruits to ripen. A: ammonia<br/>gas B: oxygen<br/>gas C: ethylene<br/>gas D: nitrogen<br/>gas

I<br/>don’t think it’s fair to make such a little kid _____ so<br/>many after-school classes. A: take B: to<br/>take C: taking D: to<br/>taking

Which of the<br/>following is mentioned by Tim as a good reason for moving? A: More office<br/>space B: Convenient<br/>parking C: Fewer office<br/>workers D: A near-by train<br/>station

You can take as many as you like because they are free of _______.[br][/br] [br][/br] A: fare B: charge C: money D: pay

John<br/>warned his families to stay away from the windows, because he was<br/>______ glass flying from storm-shattered panes. A: concerned that B: concerned<br/>with C: concerned<br/>of D: concerned<br/>about