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 |
Meeting my uncle after all these years was an unforgettable moment, ______ I will always treasure.
| A．that | B．one | C．it | D．what |
. The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |
. What the doctors really doubt is ______ my mother will recover from the serious disease soon.
| A．when | B．how | C．whether | D．why |
In order to improve English _____.
| A．Jenny’s father bought her a lot of tapes | B．Jenny bought a lot of tapes for herself |
| C．a lot of tapes were bought by Jenny | D．a lot of tapes were bought by Jenny’s father |
____that she didn't do a good job, I don't think I am abler than her.
A,To have said B,Having said C.To say D.Saying