—Kathy and her sister are so alike.—I can’t tell one from ____.
—Who ______ it be that hasn't handed in his homework?—It ______ be Bob. He handed it in yesterday.
Only those who have experienced hardship ______ well aware of what happiness means.
Even on a cold day he prefers ______ out to play football ______ at home.
It was unwise of him to ______ the unreliable data in his speech.
—Would you mind giving your advice on how to improve our business management?—If you make ______ most of the equipment, there will be ______ rise in production.