30．It was the training that he had as a child________made him such a good pianist, received by teenagers as well as adults．
| A．that | B．which | C．who | D．What |
Shortly after the accident, two ___________ police were sent to the sport to keep order .
| A．dozens of | B．dozens | C．dozen | D．dozen of |
The number of people invited __________ fifty, but a number of them __________ absent for different reasons
| A．were ; was | B．was ; was | C．was ; were | D．were ; were |
We all thought ______ a question ________we could raise enough money for the project.
| A．that; that | B．it; whether | C．it; that | D．that; whether |
It is theability to do the job _____ matters not where you come from or what you are.
| A．one | B．that | C．what | D．it |
I hate___ when people talk with their mouths full.
| A．it | B．that | C．these | D．them |