26. A new or difficult task that tests somebody's ability. a. difficulty b. ability challenge d. sleeping 27. Why do people kill woolly mammoth? a kill for tusks b. killed for meat c. kill for skin. d. killed for syrub 28. How was they take mammoth to the laboratory? a. by plane b. by crane c. by train d by helicopter Last night the man climbed through Mrs. George's window. He 29 the house and .30 jewelry and money. The man was 31 of a robber, The police looked for 32. and he could not 33 because there were three fingerprints there. So the police wanted the .34 who saw what happened Now the police ....35 it but Mrs. George doesn't think they will find the robber.