.The top leaders of the two states are holding a meeting in a friendly _______.
What ______ heavy snow. Let's go out for a walk in ______ snow, shall we?
It is pleasant to play ______ game of ______ table tennis ______ summer afternoon.
When we saw his face, we knew _____ was bad.
Biology is _____.
_____ of them knew about the plan because it was secret.