13、The use of light and dark s_______ good and evil .
14、If you’re all sitting c_______ , then we’ll begin .
15、The police had _______ filmed the conversations (稳密地) .
16、She took the car without p_______ , which made her boss angry .
17、The speech was a_______ attempt to embarrass the government (故意的) .
18、The government is ready to introduce _______ for the environment . (保护)
