用方框中所给单词的适当形式填空，每个单词限用一次。

	turn, fast, shake, science, though

 

 
It’s very important for us to study          .
My brother Tony runs          than me.
In China, we are supposed to          hands when we meet for the first time.
Last month many people          off their lights for Earth Hour 2012.
Tina doesn’t give up her dreams          she can’t speak English very well.