-- Can I call you back at two o'clock this afternoon?-- I'm sorry, but by then I ____ to Beijing. How about five?
The old man kept one black cat and two white _______.
How do you find _______ to work with the foreign engineer?
—May I have a glass of beer, please? —Beer? There is _______ left, but you can have some orange juice.
The children were catching butterflies in the garden. Some caught a lot, and others caught _______at all.
Animals don’t talk with words. They use smells, sounds and movements to communicate with _______animal.