Exercise 6. Mark the letter A, B, C, or D to indicate the correct to each of the following questions.

51. A correction pen is used for ____ your writing mistakes.

A. cover                       B. covered                   C. covering                  D. to cover

52. It's no good ____ him the truth now.

A. not to tell                B. tell                           C. telling                      D. to tell

53. It's important ____ too much about your failure.

A. not to worry            B. not worry                C. not worrying to       D. don’t worry

54. Don’t forget ____ your homework before coming to class.

A. doing                       B. having done            C. to be done               D. to do

55. Did you remember ____ Mr. Green my message?

A. be given                  B. giving                      C. have given              D. to give

56. 3-D printing ____ complex tools and components.

A. is used for produce                                     B. is used to produce

C. uses for producing                                      D. uses to produce

57. She was old enough ____ up her own mind.

A. made                       B. make                       C. making                    D. to make

58. My computer is used for ____ music and video.

A. having played         B. play                         C. playing                    D. to play

59. My father uses a calculator to ____.

A. be calculated          B. being calculated     C. calculate                 D. calculating

60. Facebook is used   ____ among the young.

A. communicate          B. communicating       C. to communicate     D. to communicating

61. Mary often watches YouTube videos to study how ____ a dish or make a cake.

A. cook                        B. cooking                   C. to cook                    D. to cooking  

62. We can use USB ____ information.

A. for being store        B. for store                  C. to store                   D. to storing

63. He ____ for the Google since 2014.

A. has worked             B. is working               C. was working            D. worked

64. Her children ____ their homework yet. They arc still working on it.

            A. hasn’t finished        B. hasn’t finishing       C. haven’t finished      D. haven’t finishing

65. I have never ____ to Paris

A. been                        B. go                            C. was                          D. went

66. We ____ a contract two years ago and it is still valid.

A. have sign                 B. have signed             C. haven't signed        D. signed

67. I have lost my mobile phone. Someone ____ it.

A. has steal                  B. has stole                  C. has stolen                D. have stole

68. Brian ____ to the travel agents and he hasn’t come back.

            A. has been                 B. has been going       C. had gone                 D. has gone

69. I am not hungry. I have ____ eaten.

            A. just                          B. ever                         C. now                         D. yet

70. ____ you ever been to New York?

            A. Are                          B. Do                           C. Have                        D. Were

71. My parents ____ us many times.

            A. has visited               B. have visited             C. visit                         D. will visit

72. Walter ____ my headphones at last.

            A. has returned           B. have return             C. return                      D. returns

73. I ____ the teacher that I will be absent next week.

            A. has told                   B. have told                 C. tell                           D. tells

74. Sally ____ the movie “Titanic” three times.

            A. has seen                  B. have seen                C. is seeing                  D. sees

75. How long ____ your best friend?

            A. did you know           B. do you know            C. have you known      D. are you knowing

76. YouTube ____ to become the world most popular video-sharing website since 2005.

            A. has grown               B. have grown             C. grew                        D. grows

77. J.K. Rowling's “Harry Potter" books ____ in many countries.

A. has been published                                     B. have been published

            C. was published                                             D. were published

78. “Would you like a coffee?" - “No thanks. ____ one.”

            A. I just had                 B. I just have               C. I was just having     D. I’ve just had