He ___ be in the garden.He must be in the room.‘

—“What courses are you going to take next semester if you want to receive enough credits to get your degree?”—“I don’t know. But it’s about time      on something.”

You    park  here! It’s an  emergeney  exit.

They have demanded that all the facts______ known to the public.

—You ought to have made an apology to Tom yesterday evening．—Yes, I know I __       __．