Write one word in each gap

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3 Write one word in each gap.
What Einstein taught us
You (1)
almost certainly heard of Albert Einstein,
but do you know why he was so important? Before Einstein,
scientists (2)
all thought that time was constant.
In other words, that three seconds is three seconds wherever you
are in the universe, and whatever you're doing. Einstein showed
that's not true and that how time passes is related to how fast
you're moving. No-one had (3)
before Einstein.
suggested this
But (4)
anyone ever tested this incredible idea?
The answer is yes, they (5)
proved it many times (6)
with it in the early 1900s. For example, scientists have taken two
atomic clocks, both showing exactly the same time, and have
(7)
. They've tested and
Einstein first came up
one round the world in a plane. It ran a little
bit faster than the clock which (8)
stationary on the ground. Today, clocks in GPS systems and
satellites have to take this theory into account.
remained