No one is allowed, no matter who he is, _____ the room unless he has a permit.

 We all know that a bright future will ______those who always look ahead instead of looking back.

.He, out of breath ,_____ himself along the street. Perhaps he was badly ill.

Don’t leave the window open—it’s ________ thieves to enter.

I saw Bob play the piano at John's party and on that ________ he was simply brilliant.