. . 1 Complete the definitions with the correct words. The first letters have been given. 1 The science that deals with the way that goods and services are produced and sold is called e 2 The scientific study of languages is called I 3 A person who studies human cultures through observations and interviews is called an e 4 A person who studies or teaches mathematics is called a m_ 5 If you want to prove a theory, you have to analyse the e first. /5 Complete the sentences with the correct phrases in the box. There are two extra phrases. app . bullet remote control · electric toothbrush . hairdryer • mouse mat . light bulb 1 Can you change the in this lamp? It's far too dark in here. 2 The battery in my is flat, so I can't clean my teeth. 3 After I had washed my hair I realised I'd forgotten to pack a 4 Would you mind reading the second point in the instructions and explaining how you understand it? 5 I spilled some coffee on the keyboard and a with a photo of my dog on it. I couldn't remove the stains, so I will have to throw it away. L/5 3. Choose the correct words. 1 Students are improving their technology / techniques in business management. 2 Just after you click on the install button, a new icon will appear on your screen / router. 3 Scientists carried out / had various experiments to prove that the device is safe for children under the age of 3. 4 The astronomers formulated / discovered their hypothesis and went on to test it. 5. Dr Dooley has proved / worked as an exploration geologist for many years. /5 /5​