一、1.instead2.allowed3.licence 4.teenagers 5.silly 二、1.drive 2.doing 3.toswim 4.to think 5.pierced6.wearing 三、1.should be asked2.should be allowed 3.shouldbe finished 4.can be used 四、1.should be allowed2.don't think; aren’t’tserious enough 3.seemed to 4.allow me to 5.spend timewith