It was not until dark _____ he found _____ he thought was the correct way to solve the problem.
| A．that; that | B．that; what | C．when; what | D．when; that |
I don’t think the experiment is ______ failure. At least we have gained ______ experience for future success.
| A．不填；the | B．a; the | C．a ; 不填 | D．不填; 不填 |
Obama has been elected ___ first black president of the United States, and the international society expects to have ____ new USA under his leadership.
A 不填；the B a; theC. the ; a D the ; the
Graduates of 2009 share ______ fate of entering the work force at a bad time, when the world is sinking deeper into ______ financial crisis.
| A．the ；the | B．a ；the | C．a ；不填 | D．the ；a |
While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.
| A．a; 不填 | B．the; 不填 | C．a; the | D．the; the |
Hey, please do mefavor. I must get some money
fromATM machine.
| A．the; a | B．a; the | C．the; an | D．a; 不填 |