irresponsible
not thinking about the possible bad results of what you are doing
significant
important
at last
finally
immoral
morally wrong
irregular
îrregular actions happen with a different amount of time between each one
decade
a period of ten years
rocket
a vehicle for travelling in space
access
when you have the right to use or see something
at least
as much as, or more than, a number or amount
at rest
not doing anything active
achievement
something good that you achieve
solution
the answer to a problem
at once
immediately
proposal
a suggestion for a plan
inappropriate
unsuitable for a particular situation
need
something that is necessary to have
illegal
not allowed by law
at first
at the beginning of a situation
space
the area outside the earth
expedition
an organized journey, especially a long one for a particular purpose
at the same time
despite this
impatient
easily annoyed because you have to wait
scientific
relating to science
prove
to show that something is true
at peace
not fighting
sponsor
to give money to someone to support an activity
at present
now
inexperienced
without much experience
concept
an idea
at war
when there is fighting between two or more countries
commercial
relating to buying and selling things
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