The key answer of exercise 3

a)

1. was discovered
2. is bought
3. is spoken
4. is called; made
5. were the Pyramids built; built
6. gave

b)

1. What's your new baby called?
2. Contact lenses were invented by a Czech chemist.
3. Where are olives grown?
4. The VW Beetle was designed in the 1930s.
5. Diamonds are found in many different colours.
6. When were vitamins discovered?

c)

1. Were you born
2. were made
3. is grown
4. was built
5. was invented

d)

1. The first electric battery was made by Alessandro Volta in 1800.
2. The first photograph was taken by Joseph Niépce in 1826.
3. The first. car was driven by Karl Benz in 1886.
4. The first X-ray was taken by Wilhelm Röntgen in 1895.
5. The first aeroplane was flown by the Wright brothers in 1903.