摘要： on
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On National Day there are more than four people in the park.
- A.thousand
- B.thousands
- C.thousands of
- D.thousand of
On ________ Christmas Day, people like to send Christmas cards to each other.
- A.the
- B.a
- C.one
- D./
On October 15, China ________ its first manned spaceship, which made Yang Liwei a hero to many kids．
- A.set out
- B.set off
- C.sent up
- D.sent out