16/ One way of preventing further flooding would be to _______ the river bed. A. deep B. deepen C. deeper D. depth 17/ It is important to educate children before they become sexually _______. A. act B. active C. action D. actor 19/ Now you know all the facts, you can make an informed _______. A. choice B. choose C. chooser D. choosing 20/ The company's new model will be going into _______ early next year. A. produce B. producer C. products D. production 21/ You _______ change trains at Peterborough if you're going to Newcastle. A. could B. should C. did D. would 22/ You _______ have a piece of cake after you've eaten your vegetables! A. can B. could C. shall D. might 23/ If you show the receipt, there _______ to be any difficulty getting your money back. A. shouldn’t B. couldn’t C. didn’t D. oughtn't 24/ They knew there _______ be trouble unless the report was finished by the next day. A. ought to B. should C. would D. must 29/ There are, _______ you don't mind me saying so, one or two problems with this plan. A. if B. provided C. in case D. as long as