The cancer risks ___________ smoking have been well documented.
You_____seeher,butImust.
Thebushadleft,sowe_____walkhome.
Thedoorisstillclosed.He_____thekey.
Mary_____beinLondonbecauseIsawherintownjustnow.
Whenhewasold,MrSmith_____sitforhourswithoutsayinganything.