—Bob, you______ on the phone. —______.
He is afraid to face the difficulty he thinks he’ll have the driving test tomorrow; he finds it difficult rid of the worries.
After the long journey, the Smiths returned home, ____.
Not everyone has realized what_______ important part the balance of________ nature plays in their life.
It’s easier to catch a _____ lion than the one that’s awake.
Mr. Smith didn’t go to the party because he had a lot of experiments _____.