trắc nghiệm đó làm hộ với XIII. Choose the best answer A, B, C, or D to complete the sentences. 91. People from other planets may use _______ to communicate, which is not possible for human beings. A. Landlines B. letters C. chat rooms D. telepathy 92. Teenagers often use abbreviations when ________ . A. Texting B. video conferencing C. sending letters D. talking 93. People who cannot hear or speak often communicate using________ . A. Pictures B. sounds C. codes D. signs 94. ______ is popularly used to enable people from different countries to have meetings. People can watch, and listen to each other through a screen. A. Chatting B. Video conferencing C. Emailing D. Texting 95. The_______ in technology allow astronomers to know more about outer space. A. Developments B. science C. exploration D. discovery 96. Alexander Graham Bell was a great _______ , who invented the telephone. A. Developer B. conservationist C. scientist D. explorer 97. ______ is important because it may help to solve the problems of overpopulation and exhaustion of resources on Earth. A. Space exploration B. Space travelling C. Space checking D. Space walking 98. To generate cheap and clean energy, instead of burning fossil fuels, scientists have developed _________ . A. Oil B. solar panels C. electricity D. coal burning 99. ________systems use several different ways of giving information with sounds, pictures, and texts on a screen. A. Emailing B. Telephoning C. Multimedia D. Chatting 100. Astronauts use ________ to move around when they are on the Moon’s surface. A. Spaceships B. flying saucers C. space cars D. moon buggies