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 |
The footprints on the floor __________ that someone had broken into their house while they were out.
| A．recognized | B．forecast | C．indicated | D．observed |
Our country ________ great changes in the past 30 years and it is no longer________ it used to be.
| A．went through; what | B．has gone through; that |
| C．experienced; that | D．has experienced; what |
Not everybody knows exercising too much can_________ serious pain and even injuries.
| A．attach to | B．attend to |
| C．contribute to | D．devote to |
—Jane looks down today, what’s up?
—Well, ________happened between Jane and me is none of your business.
| A．whichever | B．whatever |
| C．no matter which | D．no matter what |
All his hard work finally ________ in the summer of 2014, when he was admitted to his dream university.
| A．took off | B．ran off |
| C．set off | D．paid off |