1. The students were in their use of recycled materials to build a model of a space shuttle.

2. The is the main support structure for the International Space Station.

3. Each of the space station is designed to link easily with others.

4. Alexander the Great many ancient lands to build a huge empire.

5. The space landed on Mars and sent back pictures of the planet.

6. The stars twinkle and shine in the clear night sky.

7. The of space by satellites began in the late 1950s when the Russians launched Sputnik 1.

8. The for launching rockets are solid and liquid fuels.

9. Outer space is a vast in which there in no matter, not even gases.

10. Robot arms have been used to help the International Space Station.

11. The story has a pattern that includes a sentence that repeats over and over again.

12. We watched as deer drank water from the small ravine, or , in the forest.

13. The farmers built terraces so that they could use the hilly as farmland.

14. Earth’s has four layers of air.

15. The passengers fastened their seat belts in preparation for the airplane’s and landing.