我国古典小说《三国演义》写诸葛亮用木马车送梁,而不用汽车;《西游记》中的孙悟空七十二般变化,就是变不出一辆坦克车,这是因( )
The school offers many _____ activities for the local students.
It is ______ that the noise around us is a(n) _______ to our health and well being.
We can broaden our horizons through _________ to new things.
Jack’s house has been broken into twice and now he takes________ against theft at any time.
The environmental organization calls on customers not to purchase these _______ packages of food, clothes and gifts.