Can you see that building ______ by trees? That’s ______ we study.
39.Since she was badly ill, her friend visited her ___.
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.