—What are you doing?
—I'm the key to the door.
A. finding out B. looking after C. looking for
--- What’s your family rules?
--- We shouldn’t talk ____ food in our mouths while having meals.
| A．with | B．in | C．of | D．at |
--- What’s the matter, Mary? You looked upset.
--- I failed again in my math exam. I’m really sorry because I don’t want to ____ my parents down.
| A．turn | B．write | C．let | D．take |
--- Do you have any plans for this weekend?
--- I’m not sure. I _____ go climbing Mount Baoshi.
| A．must | B．can | C．need | D．may |
The world’s population is growing ______, and there is ____ land and water for growing rice.
| A．larger; less | B．larger; fewer |
| C．more; less | D．more; fewer |
Lincoln came from nothing, yet but he did ____ that changed the world.
| A．something | B．anything |
| C．everything | D．nothing |