Do Ex 1
Read the text
rough: not exact; not including all details. Approximate.
E.g.
a rough calculation/estimate of the cost
I've got a rough idea of where I want to go.
There were about 20 people there, at a rough guess.
a rough draft of a speech
It's only a very rough guide.
We only had his rather rough version of events.
He gave us a rough estimate of how much the work would cost
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