Answer these questions about the interview. 1) John thinks we should . 
a) go to Mars b) wait a few years c) not waste money
2) He talks about . 
a) rovers b) martians c) shuttles
3) He says that maybe . 
a) people will be afraid b) people will not come back c) people will fight to go
4) He compares space travel to . 
a) aliens b) heroes c) explorers
5) He says the trip will be for people. 
a) one-way b) round-trip c) impossible
New phrases:
Liquid is a substance that flows freely.
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