Unemployment in USA is likely to remain high in 2010, and _______ for the next few years.
| A．possibly | B．necessarily | C．gradually | D．normally |
Human beings are different from animals _________ they have languages.
| A．where | B．in that |
| C．in which | D．for which |
At school, some students are active, ______ some are shy, yet they can be good friends with one another.
| A．while | B．although | C．since | D．thus |
___________ seems hard to believe is that the bird the officer uses is the same bird often seen in public parks----the pigeons.
| A．What | B．Whatever |
| C．Which | D．That |
I’d appreciate _______ if you could let me know in advance whether you will come or not.
| A．it | B．you | C．one | D．what |
It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
| A．when | B．that | C．which | D．what |