Vocabulary 4 Complete the sentences with the missing words. The first letter of each word has been given. 1 Modern bicycles are sometimes made out of a_ _ _ _ _ _ _ _ because it is lighter than other metals. 2 P_ _ _ _ was invented thousands of years ago as a material to write on. 3 Objects like cups, plates and vases are often made of c_ _ _ _ _ _. 4 Walls in the countryside are often built of s_ _ _ _. 5 C_ _ _ _ _ is a soft reddish-brown metal which is often used for making coins. 6 G_ _ _ is an expensive metal which is often used to make wedding rings. 7 Many shoes, boots and bags are made of l_ _ _ _ _ _. 8 S_ _ _ _ is a type of metal that is used in tall buildings and bridges to make them stronger