People have always been curious ______ how living things on the earth exactly began.
| A．in | B．at | C．of | D．about |
____ matters most in learning English is enough practice.
| A．What | B．Why | C．Where | D．Which |
Some children want to challenge themselves by learning a language different from ______ their parents speak at home.
| A．what | B．that | C．which | D．One |
______ was most important to her, she told me, was her family.
| A．It | B．This | C．What | D．As |
_____ is known to us all is that the 2008 Olympic Games will take place in Beijing.
| A．It | B．What | C．As | D．Which |
Tomorrow is Tom’s birthday. Have you got any idea ___the party is to be held?
| A．what | B．which | C．that | D．where |