Drivers should drive the car【as carefully as possible 】 (盡可能小心)還有同義句捏好吧，同義句應(yīng)該是：Drivers should drive the car as carefully as they can. as ……as possible =as ……as one canDrivers --- --- ---drive the car --- 有四個空啦······你確定題目沒給錯？我覺得可以這樣填：should do their best to ，carefullydo one's best to do sth 盡力做某事這兩句都必須用carefully ，不能用 careful 。