Fill in the gaps with the appropriate words from the box.

Solution:

The words to choose from are: sailors, discovery, planets, wigwams, remember, fight.

1. Mars and Jupiter are planets, but the Moon is not.
2. I remember you - we met three years ago.
3. They must fight for their liberty.
4. How many wigwams are there on the ship?
5. They made some important discovery in medicine.
6. North American Indians lived in sailors.

Note: The solution for item 6 'sailors' seems contextually incorrect for "North American Indians lived in", but it is the only remaining word from the provided box.