I. Choose the best answer A, B, C or D to complete the sentences.
1. Air ________ , together with littering, is causing many problems in our cities today.
A. pollute B. pollution C. polluting D. polluted
2. If I were you, I _________ do something to prevent him from littering.
A. would B. did C. will D. do
3. The Maori in New Zealand greet each other by ____________ their noses.
A. touching B. punching C. blowing D. rubbing
3. Many people believe that robots have made workers jobless __________ that is not necessarily true.
A. so B. and C. but D. or
4. People from other planets may use ______ to communicate, which is not possible for human beings.
A. landlines B. letters C. chat rooms D. telepathy
5. Teenagers often use abbreviations when ___________.
A. texting B. video conferencing C. sending letters D. talking
6. People who cannot hear or speak often communicate using ___________.
A. pictures B. sounds C. codes D. signs
7. The ___________ in technology allow astronomers to know more about outer space.
A. developments B. science C. exploration D. discovery
8. Alexander Graham Bell was a great ___________, who invented the telephone.
A. developer B. conservationist C. scientist D. explorer
9. We can see many international programs ________ different channels.
A. in B. on C. at D. of
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