4 Complete the text with one word in each gap. Then add commas for any of the
non-defining relative clauses.
people
3
You and your ancestors
For every person on the planet, there are two
are their biological parents,
four grandparents and eight great-grandparents.
Above is a diagram? shows one person's
ancestors for four generations. The top row
has 16 people shows your great-
great-grandparents. It's interesting to think of
all the different places
they lived and
the people they married. If you go
back 200 years in time to the 19th century, you'll
probably find as many as 128 ancestors! So
a stranger
you pass in the street could
be
your long-lost cousin!
4
6
great-great
grandparents
great
grandparents
grandparents
parents
Luisa
​