Exercise 7. Mark the letter A. B, C, or D to indicate the underlined part that needs correction in each of the following questions.
79. The king's biodiesel oil projectwas firstto introduce in 2001.
A B C D
80. The Tesla Coil is used for createextremely powerful electrical fields.
A B C D
81. IBM is an artificial intelligence computer system and is used to answering questions posed in natural
A B C D
language.
82. Lifc without computers has seemedsimplyimpossible now.
A B C D
83. Kodak Company produced many OLED equipped products, which are being used to power the next
A B C D
generation of ultra-thin televisions, since 1987.
84. Vaccination hasbeen used for a long time for prevent diseases.
A B C D
85. The boat rudder was invented to steer large ships, which enabled the Chinese for building huge ships as
A B C D
early as 200 AD.
86. Many young people now use computers for playing games rather than study.
A B C D
87. You can use a tablet to listening to music, surfing web or chatting with friends.
A B C D
88. Since the Internet was first created in the 1960s, it changed people’s lives a lot.
A B C D
89. Scientists have researchedsince years into ways of curing cancer patients.
A B C D
90. Many teenagers now preferchatting on the computer to meetface to face.
A B C D
