Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day．
| A．of; to | B．for; to | C．on; on | D．in; on |
If law and order as well as rules and regulations ______, neither the citizen nor his property is safe.
| A．are not observed | B．is not observed |
| C．were not observed | D．was not observed |
It’s better to express your anger ______ bottle it up.
| A．more than | B．other than | C．rather than | D．or rather |
At the class meeting the students discussed three different _______ to the study of English.
| A．means | B．approaches | C．methods | D．ways |
Don’t mention that at the beginning of the story, or it may ______ the shocking ending.
| A．give out | B．give away | C．give up | D．give off |
______ regular exercise is very important, it is never a good idea to exercise too close to bedtime..
| A．If | B．As | C．Unless | D．Although |