Exercise 3: Write the words in the correct blanks.
Learning about Air and Space
The Smithsonian National Air and Space Museum is a great place to visit. It contains many airplanes and spaceships that show the Answer of air and space travel. Some exhibits Answer the lives of famous Answer . Others explain how airplane and rocket Answer work, and you can also learn about other Answer. The museum has many interesting Answer and photographs. There are also Answer that visitors can touch and examine. The museum often organizes new exhibits. For example, a recent exhibit explained how the hot air balloon was Answer. It explained how hot air balloons Answer gracefully through the air without Answer back to Earth. The museum is located in Washington, D.C.
History / describe / engineers / engines / machines / drawings / models / invented / float / sinking