--- Is Mr. Smith in his office now?--- No, he there. I saw him in the library a minute ago.
I don’t know _______ .
----I feel tired and sleepy. -----Why not stop _______ ?
If there are ______ trees, the air in our city will be _______ cleaner.
There____ a football game on TV this afternoon .
I can______ you my dictionary,but you can______ it for only a week.