With more than half a billion people (5) on television, Armstrong (6) the ladder and said,“That’s one small step for a man, one giant leap for mankind.” and Aldrin (7) him shortly....

Câu hỏi :

With more than half a billion people (5)                                on television, Armstrong (6)                               the ladder and said,“That’s one small step for a man, one giant leap for mankind.” and Aldrin (7)             him shortly. They explored the surface for two and a half hours, collecting samples and taking photographs.