1.--need___I take exercise now,doctor?
--No.You need to rest.You_must__exercise in three months time.
2.--Oh,how nice the skirt is!_may/can__I try it on?
--Yes,of course.
3.--__can/may__I use your dictionary,Kitty?
--Of course you__can__,Millie.We're good friends.What's mine is yours.