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dried food

by the year 2100

the rapid increase in population

it is hoped that

start (all) over again

large numbers of passengers

with the development of technology

compare with/to...

prevent oneself from floating off into space

carry out

the percentage of students

get ill from living there

if/whether it's worth the risk

start with a discussion

about a survey

after all

the population on the Earth

be aware of/that

be in agreement

the possibility of

be in no doubt

polluted

rapidly

uncomfortable

specially

electronic

passengers

possibility

Compared

A

D

B

A

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