You should be __(polite)than before

You should be __(polite)than before you should be better than before 这句 话有木有语法错误? 翻译I believe that you will be more polite than before You should be polite(改为祈使句) Old people should be spoken to __(polite). We Chinese should be ()(creative) than before If you eat __ sweet food,you will be healthier than before.A You should work ________(hard) than before. you should be polite when you (meet)your teacher tomorrow You should be polite to the old.改为祈使句 （Be polite to the old you should ____your parents' words and be polite You should be polite to Chinese people这句话对不对?