20．—Is that Dec. 21, 2012 is the end of the world true?
—Definitely not, but________must be paid to the global climate change.
| A．attention | B．care | C．contact | D．Influence |
Although punctual himself, the professor was quite used _____ late for his lecture.
| A．to have students | B．for students' being |
| C．for students to be | D．to students' being |
The pressure _____ causes Americans to be energetic, but it also puts them undera constant emotional strain (过度紧张).
| A．to compete | B．competing |
| C．to be competed | D．having competed |
_____ it or not, his discovery has created a stir in scientific circles.
| A．Believe | B．To believe | C．Believing | D．Believed |
After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys _____ to go to school.
| A．to be encouraged | B．been encouraged |
| C．encouraged | D．be encouraged |
There's a man at the reception desk who seems very angry and I think he means_____trouble.
| A．making | B．to make | C．to have made | D．having made |