----- Believe it or not, my sister and I are twins. ----Oh, you must have had the case ________ you were taken for your sister.
Teenagers shouldn’t be _______ from school although they don’t do well in their studies.
--- Look! Everything here is under construction. --- What’s the pretty small house that _______ for?
In our class there are 46 students, _______ half wear glasses.
Mr. Thomas is ______ a teacher to us. We look on him as our friend.
---Whose case is it? --- I’m not quite sure. But maybe it _______ Mr. White.