--- Have you finished all your homework?--- Of course. I ______ it before I went out to play football.
We should try our best to make ______ world that is safer, cleaner and healthier than ____ one we are living in now.
—Hey, Tom. Let's go swimming.—Just a moment. I______ a message.
—What should we do to reduce food waste?—In a restaurant only order as________ as we need and try to eat it up.
-Why does Joe look so today? -Because she has got an “A”in her English test.
Jimmy bought ______ car yesterday, but it’s ______ used one.