The two girls are so alike that strangers find ________ difficult to tell one from the other.
I think Mrs. Stark could bebetween 50 and 60 years of age.
Raymond's parents wanted him to havepossible education.
______the nurses want a pay increase, they want reduced hours as well.
—Who’s that at the door?— is the milkman.
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.