(2012·衡水高二检测)—I’ll help you prepare for the party on Wednesday. —Please don’t _______. My sisters have promised to help me.

 This printer is of good quality.If it ________ break down within the first year，we would repair it at our expense.

In order not to _____ in front of the audience, the speaker spent many hours preparing his speech. 

When realizing they would be ___ of traffic jams or air pollution more people will choose public transportation. 

This important lesson by Professor Wang teaches primary students how to ______ themselves from danger.