How can we save water?---- We can save water_____ fixing a dripping tap.A. to B. with C. by
---Mum, may I go out to play football this afternoon? ---You can if your homework .
---Now the air in our hometown is even than it was before. ---So we must do something to stop it.
_______ some ways , there are many changes in our hometown .
The old man lives ____ in a _____ house, but he doesn’t feel_____.
— Is your father in? — No, he ______ for three hours.