You should have put the milk in the ice box. I expect it ___undrinkable by now.
_____explanation is necessary.
He is_____his elder brother.
Those ___ want to see the film please put down your names here. A which B what C whose D who
. Lily would never forget the evening ____ she lost the ring. A which B when C at which D where
He talked happily about the men and books____interested him greatly in the school. A that B when C who D which