Fill the gaps in the following sentences by using either what or which. 11 people whose names begin with a always get taken first . . is most unfair. 12 he played the violin all night . . annoyed the neighbours. 13 when the mechanic opened the bonnet he saw at once . . was wrong with the car. 14 i didn't buy anything because i didn't see . . i wanted. 15 they sang as they marched . . helped them to forget how tired they were. 16 i saw a coat marked down to £ was just . . i was prepared to pay. 17 he was very rude to the customs officer . . of course made things worse. 18 show me . . you've got in your hand. 19 tell me . . you want me to do. 20 the frogs croaked all night . . kept us awake. 21 all the roads were blocked by snow . . meant that help could not reach us till the following spring. 22 you needn't think you were unobserved! i saw . . you did! 23 she was once bitten by a monkey . . made her dislike monkeys for the rest of her life. 24 some dairies have given up electric milk floats and gone back to horsedrawn vehicles . . shows that the horse still has a place in modern transport. 25 she expects me to clean the house in half an hour . . is impossible. 26 he poured water on the burning oil stove . . was a crazy thing to do. 27 would you know . . to do if you were bitten by a snake? 28 they turned on the street lights . - made it suddenly seem much darker than it really was. 29 i don't know . . delayed the train, but it went much slower than usual . . made me late for my appointment. 30 he asked a question . . i answered, and then he asked exactly the same question again . . showed me that he hadn't been listening. 31 the crime was not discovered till 48 hours later . . gave the criminals plenty of time.