we should allow twenty-year-olds to drive（改成被动语态）
twenty-year-olds____ _____ _______to drive.
2.我们将参观一个具有悠久历史的地方 we will visit a place____ ______ ____
3.work hard,and you will s____ some day
4.teenagers should be allowed to make decisions by t____
5.it's_____( 必要的）for me to take exercise to keep fit