Put a preposition from the box into each gap.

For, without, on, of about, before.

1)What do we think ...when we use the words "The world around us"?
2)We see ...us many things such as large lands and mountains, woods and rivers.
3)We know that there are many seas, lakes and rivers ...the Earth.
4)Water is a source ...life on the earth.
5)All living beings are not able to live ...water.
6)Many rivers and lakes are polluted and cannot be used ...drinking.

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