Đọc và trả lời câu hỏi

In 1969, astronaut Neil Armstrong became the first person to set foot on the Moon, taking a giant leap for mankind. This was the first time anyone had walked on the surface of another world Eleven astronauts walked on the moon over the last few years, but no more have visited since the year 1972. Do you think it's time we went back? Exploration of the Moon did continue after the astronauts had left, but by robots instead of people. Remote control probes and satellites have helped us to learn more about our neighbour in space. They have shown that there is much more exploring to do, but astronauts would be needed for that! The proplem is that sending humans to the Moon is very expensive. Even with all the advances in technology that we have made since Neil Armstrong's time. SA's idea is not to make the spaceships and equipment needed themselves, or even just with other space agencies, but to also work with businesses here on Earth.
I. When did Neil Armstrong set foot on the Moon?
2. Was this the second time an astronaut had walked on other planet?
3.How many astronauts walked on the Moon over the last few years?
4.What is the problem of sending people to the moon?