Lots of astronauts ________(has/have) been to the space station .They found it very interesting.

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• Lots of astronauts ________(has/have) been to the space station .They found it very interesting.why?请说明，has和have有什么区别？
• Put the words in the correct place in each sentence.例句：Astronauts have been to the moon.(already) Astronauts have already been to the moon. 1.They haven't been to Mars.(yet) 2.Many astronauts have visited the space station.(already) 3.The spacecraft has reached Mars.(just)
• Put the words in the correct place in each sentence.例：Astronauts have been to the the moon(already)Astronauts have already been to the the moon.1.They haven't been to Mars.(yet)2.Many asteonauts have visited the space station.(already)3.The spacecraft has reached Mars.(just)
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