when you read or hear them, but you should also try to extend your active vocabulary by using them in your writing and speaking tasks. You should [earn the correct spellings of words as well as any words that collocate, or can be used together with them. Use Units 21 and 22 to help you develop good vocabulary learning strategies. | est Four Uni Choose the correct letter A B C or D. i People would use a lot less power if they bought household goods that were energy. A effective B efficient C economical D ecological 2 car exhausts have a significant effect on global warming. A emissions B smoke C gases D acid 3 Our greatest problem is that we and more fossil fuels each year and supplies are dwindling. A conserving B consuming C producing D preserving 4 We need to persuade people to change their habits so that energy. A consume B conserve C produce D use 5 In the future we will need to sources such solar power. A recycled B reinvented C renewable D reusable 6 If oil supplies run out in 2015 then we need to sources soon. A alternate B alternating C alternative D altering 7 I need to earn a lot I can afford to buy that car. A payment B salary C wages D money 8 I am writing to complain about a recent problem I had with a member of your. A company B employees C staff D workplace 9 The company lost a great deal of money when one of found to be faulty. A goods B products C manufacture D business io The government should do more to help a job. A employed B employment C unemployment D unemployed n Taking a packed lunch to work can be a lot buying it every day. A economical B economics C expenditure D expenses 12 I d really like to find the summer holidays. A job B work C profession D career 13 I think that people crimes should be punished. A convict B commit C offend D offence 14 I had to pay parking my car in a restricted area. A fine B find C fee D form 108 Test Four Units 16-20 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Helping poor people to find a job may help . A avoid B deter C impose D prevent I don t agree young or petty criminals. A committing B enforcing C imprisoning D offending In most countries it law to steal other people s property. A .
