21. — Jay Chou is in our city. Let’s go and watch his show this Saturday.— That’s great, but I need to call my dad and ask for _________ before I go out.
I admired my classmate Lisa very much. her prettiness, she was smart and helpful.
Children are not recommended to see such films bad for their mental development.
Because of Einstein’s Theory of Relativity, scientists never again regarded the world .
--- Hurry up. The bus is coming. --- Oh, no. We mustn’t cross the street the traffic lights are green.
Sorry, you lost your purse; I hope it will some day.