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不正解！
正　解：bright colors in the night sky.

時　間：24032秒
正解数：0問

第10問目
以下の文では、最後の文が未完成です。段落の下にリストされている4つの選択肢から、適切な文を選択してください。
When people began to try to create a "flying machine" in the eighteenth century, they used hot-air balloons. These balloons went up into the air but then could not be controlled. They went wherever the wind was blowing. The idea of a real flying machine remained a dream for a long time. That dream finally came true in 1903, _ when Wilbur and Orville Wright .
invented a new kind of engine.

flew across the Atlantic Ocean.

made their first successful flight in an airplane.

invented the hot-air balloon.



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