The key answer of exercise 9

a)

1. Lipstick was invented in Iraq.
2. Electric razors were introduced in the 1930s.
3. Milk chocolate was first sold in the 1870s.
4. The first email was sent in 1991.
5. 426 million dollars were spent on jewellery in the world in 2010.
6. In Ancient Egypt, the metals copper and lead were used to make eyeliner.
7. The world's first MP3 player was produced in 1997 in Korea.
8. More than 30 million i-pads were sold in 2011.
9. The first wallpaper was printed in France in the 18th century.
10. The vacuum cleaner was invented by a cleaner who became ill every time he cleaned a floor.

b)

4 is incorrect: the first email was sent in 1971.