“Aha, you’re a chain smoker！” “Only at home. Nobody _______ that but you.”
| A．discovered | B．had discovered |
| C．discovers | D．is discovering |
Only ______ a human being.
| A．when is it hungry a lion will attack | B．when it is hungry a lion will attack |
| C．when it is hungry will a lion attack | D．when is it hungry will a lion attack |
Don’t ______ a person only because he has failed in an examination.
| A．look up | B．look down | C．look down on | D．look up to |
I wanted to catch ______ early train, but couldn’t get ______ ride to the station.
| A．an; the | B．/; the | C．an; / | D．the; a |
What he said at the meeting means _______ those who had cut down the forests.
| A．to argue against | B．to argue for |
| C．arguing for | D．arguing against |
She won a Nobel Prize for her scientific ______.
| A．interests | B．achievements | C．behavior | D．observation |