Sam _____ some knowledge of the computer just by watching others working on it.
Don’t try to cheat the taxman(税务人员); you’ll never ______it.
The chairman asked me to ______my speech to 20 minutes.
Seeing the enemy, Gary was behaving as though nothing ______.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
—Have you heard the story of “The Merchant of Venice”? —No. When and where does the story ______ ?