54. Which of the following is an invention?

    A. A forest                                        B. A sheep

    C. A river.                                         D. A train.

53. What do inventions have?

    A. Computers                                    B. Machines

    C. Labs                                             D. Clever ideas.

52. People didn’t have such things as pens or rulers _________________.

    A. a century ago                                 B. thousands of years before

    C. thousands of years ago                    D. several centuries later

51. Who make most of the things in your school bag?

    A. Workers                                        B. Farmers

    C. Shopkeepers                                  D. Inventors

  49. A. saved                            B. laughed at         C. caught                      D. thanked

  48. A. always                   B. never                C. often                        D. usually

  47. A. girl                        B. boy                   C. woman                     D. man

  46. A. different                B. same                 C. fat                           D. bad

  45. A. thought                  B. spoke                C. said                         D. agreed