I. Fill in the gaps using the words (one-of-a-kind, motivation, expansion, release, overcome, colonies)

1. One of the….behind space exploration is to discover other life on Earth.

2. The ….of the universe takes place as galaxies move further apart.

3. James Cameron used…..techniques in the film that had never been used before.

4. In the future, scientist hope to build…..in space.

5. Mankind still has many challenges to ….before space colonization becomes a reality.

6.Cars ….toxic emissions that damage our environment.​

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