1.My brother (have to,has to) wear a tie at his work.He is a lawyer. 2.He(have to,has to)wash the car. 3.they(must not have to,don't/does not have to) get up early today,because it's Sunday. 4.You(should,should not)walk on the grass. 5.You(must,can)keep a secret 6.You(must not,must)smoke in the office.it is the rule. 7.We have a lot of work tomorrow.You(must not,don't have to) late. 8.You(may,may not) eat in the conference room. 9.Tghe baby is sleeping.You must not, must) shout.​