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.
a) In those times, the ancient Egyptiansmake bricks that
they used to build silos.
b) They alsothink about how to keep their harvest safe
from rats and mice.
c) The ancient Egyptiansplant different types of crops
such as fruit, vegetables, and beans.
d) But ancient Egyptiansplant crops throughout the whole
year.
e) The ancient Egyptiansinvent their own calendar.