根据句意及词首字母或汉语提示，补全单词。
（1）Don't talk  l____  in the classroom. It's impolite(不礼貌的).
（2）The movie is so boring. I can't s____  it.
（3）The clothes shop is on sale. This shirt is very c____ .
（4）Yesterday, Kate studied for the English t____ .
（5）Please ____  (记住)to turn off the lights.