Rewrite the following sentences using “must/ mustn’t/ need/ needn’t/ can/ can’t” and the correct verb forms. One example has been done for you

Example: It is necessary for us to remind you that the money is now due. 

             = We need to remind you that the money is now due.  
1. After such a huge lotter win, it is not necessary for him to work again. 
=After such a huge lotter win, he _________again. 
2. Jack is an excellent tennis player. He is able to beat anybody.
= Jack is an excellent tennis player. He_________ anybody.
3. It is necessary that candidates do not bring books into the examination room. 
=Candidates________books into the examination room. 
4.Promise that you’ll never do it again!
=You ________it again!
5.I don’t know what you are saying. 
=I ________you.
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