i am on diet.here i am on a diet means Ai am ill Bi am busy

1.阅读填词.My doctor tells me to go on a diet ,b（）I am overweigh i am on fto I am keen on I am on the I am on I am busy now I AM BUSY NOW? 首字母填空：Though I am ill ,I have a good doctor a___ on me!I wil I am busy on weekend but I am free at the w____.怎么写? I am wishing on a star I am heading out on a mission I am going on a big trip.