The atmosphere of the earth ______ us from the strong sun light.
As an experienced journalist, he always has a nose ______ a good story.
______ example of John shows that ______ knowledge of first aid can help a lot.
The hostess left the money on the table _____purpose to test the honesty of her maid.
People in ancient times ______ series of important events so that we now have what is called history.
It was the first time ______ I ______ here.