Put the words in the correct order

Exercise 3: Put the words in the correct order.
1. a / new / discovered / scientists / planet
2. size / of / Mars / the / is / it
3. for / necessary / a / is / class / English / textbook
4. faces / a / mirror / reflects
5. a / invented / Galileo / telescope
6. Duarte / saw / the / shark / among / a / dolphins
7. like / at / to / the / I / night / stars / observe
8. night / dark / was / completely / the