C. Fill in: compilation, contact, spacecraft, heating, solar. 11. Will inhabitants of other planets ever try to ... us? 12. The ..... system includes the sun and the planets that go around it. 13. Peter made a ..... of rock songs and burned it onto a CD. 14. It was cold in the house because the ..... wasn't working. 15. Yuri Gagarin travelled in a ..... called Vostok I.

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