-- Must I come here at eight o’clock?                                           -No, you ____. You may come a little later.                                      

It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.

—Where _____ Mary have put the empty bottles? — She _____ them away. They must be somewhere. 

—How much shall I pay for the telephone call? —You  _____. It's free.

It’s quite warm here; we __________turn the heating on yet.