How would you say these sentences please?<br/><br/>1 I'm stuck on/at level 3.<br/><br/>2 He's less than 40/under 40 years old.<br/><br/>3 The streets are (situated) close together.<br/><br/>4 Button the first two buttons on/of the jacket.<br/><br/>5 I followed someone who didn't know where he/one was going.<br/><br/>Thank you