Knowing how long the test would last, the students who finished ____ back and waited until the end of the exam.
There are ten boxes on the desk and the ______ is yours.
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 _____.