--Why are you so depressed, Lily?

--- I lost the contest narrowly, or I _________ the award of $10,000.

A．had gained

B．would have gained

C．would gain

D．must have gained

航天员费俊龙和聂海盛乘坐“神舟六号”飞船返回舱返回地球时，返回舱相对于地球是___________的，返回舱相对于___________是静止的。