51Talk level 7教材电子版51Talk level 7教材电子版 1. Stick the stamp on the envelope (Stick sth1. on sth2.) 2. Hang out with sb:与某人闲逛。 I'm just going to the mall to hang out with some friends. 3. go to college 上大学 4. Your pronunciation is perfect. 发音非常准确 5. ...