The sun may collaspe someday.
The earth has both day and night.
The Earth's orbit is elliptical in shape.
The sun is a star.
A 1 kilogram cup
A 10 kilogram cup
A 100 kilogram cup
A 1,000 kilogram cup
Stawberries are good for you.
There are many good long-lasting batteries.
Electricity travels better through copper wire than brass wire.
Lettuce tastes better with salad dressing.
No running in the lab.
You may drink water in the lab.
Wear goggles when heating liquids.
Know how to work the fire extinguisher.