We will use caustic soda in this experiment.

Index fossils are an important clue to indicate a specific geological era.

This truck is overloaded, it's dangerous to drive on the road.

My housekeeper is very helpful.

Please underline this word.

We go fishing in this river every weekend.

Every weekend, we enjoy picnics on the flood plain along the river.

The use of fossil fuels is causing global warming.

Please try writing a sentence using this substitute character.

Nobuyo is my best friend.