Match the invention to its inventor.
| Telephone | Morse Code | Hot-air balloon | Automobile | Airplane | Diesel engine | Helicopter |
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| a | b | c | d | e | f | g |
| Igor Sikorsky | Rudolf Diesel | Montgolfier brothers | Wright brothers | Karl Benz | Samuel Morse | Alexander Graham Bell |
2. What do you think are the most outstanding inventions in human history? Why are they important?