Complete the paragraph. Use the words in the box.

Finally ,Before, During, Later, After, When, In, On

____October 4, 1957, the Soviet Union shocked the world _____it launched the first artificial satellite into space. The satellite known as Sputnik sent signals back to Earth _____its many orbits of the planet. It stayed in space for three months___ it fell back to Earth. But Sputnik wasn’t the only satellite the Soviets launched in 1957. ____ that year, shortly ___ launching the first Sputnik, the Soviets sent Sputnik 2 into space.
___December that year, the Americans responded by launching their own satellite—the Vanguard TV3. It failed. But on February 1, 1958, the Americans ___succeeded with the launch of Explorer 1.
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