—Everyone in my class passed the exam.
—Oh, really? It ________ difficult.
| A．can’t have been | B．needn’t have been |
| C．must be | D．mightn’t be |
Too many young people doing volunteer work just for their resumes is ______ to the very purpose of volunteer groups and reduces their effectives.
| A．effective | B．faithful |
| C．artificial | D．contrary |
It’s high time that we gave ______ attention to our world climate and led a low-carbon life, or the consequence would be too serious for us to face.
| A．effective | B．gradual | C．due | D．temporary |
News reports say peace talks between the two countries have ______ without reaching any agreement.
| A．broken down | B．broken out |
| C．broken in | D．broken up |
The shortage of entry-level job is the main reason that more university students are ______ business of their own right after graduation.
| A．setting up | B．speeding up |
| C．picking up | D．making up |
“Tonight, I ask people to ______ violence and words that harm, and turn to words that heal －prayer, patient dialogue, and sympathy for the friends and family of the fallen.” President Obama said .
| A．refresh | B．reject | C．transform | D．tick |