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 If you _____ smoke, please go outside.

   A. can                 B. should          C. must          D. may

If you         smoke, please go outside.

   A. can     B. should     C. must     D. may

 If you ________ smoke, please go outside.

   A. can                            B. must                        C. should                    D. may

If you _______ smoke, please go outside.

A. can　　　　　 B. should　　　　 C. must　　　　　 D. may

If you __________smoke, please go outside.

A. can　　　　　 B. should　　　　 C. must　　　　　 D. may

If you ______ smoke, please go outside.

A．can 

B．should

C．must 

D．may

If you         smoke, please go outside.

A．can                              B．should                   C．must                     D．may