eptember 2008 , China’s key milestonein space travel_____when Zhai Zhigang conducted the first space walk.

They hurried to the train station, it was too lateThey had to wait another ten minutes

_____ of the danger, he still wentskating on the thin ice.

______ the age of 89, he passed away ______ acold winter morning.

They argued _____ the matter the whole afternoon, and at last agreed____ the date for the next meeting.[ ]