摘要： will -- is
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_________ is known to us all is that the 2008 Olympic Games will take place in Beijing.
- A.It
- B.What
- C.As
- D.Which
________ is no doubt that he will come here some day, but ________ is doubtful when he will come.
- A.There; there
- B.It; it
- C.There; it
- D.It; there