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 £10... 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.