4. The sentences below are from the radio program above. Complete the gaps with the correct verb form could or had to. Then listen
again and check.
b) They also
a) In those times, the ancient Egyptians
make bricks that
they used to build silos.
think about how to keep their harvest safe
from rats and mice.
c) The ancient Egyptians
plant different types of crops
such as fruit, vegetables, and beans.
d) But ancient Egyptians
plant crops throughout the whole
year.
e) The ancient Egyptians
invent their own calendar.​

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