The village was ______ by the snow for more than a month.
There are ___ kinds of reference books in the library.
The skirt is too large for me.Would you show me ___ one ?
The children are giving their classroom a good cleaning, ___ are sweeping; ___ are mopping.
Tom,Bob and Betty have arrived, but ___ students haven’t yet.
He has three pencils.____ is red, ___is blue, and ____ is green.