cotton balls
cotton pads
cotton flakes
wool balls
______ while brushing teeth to avoid wasting water.
Turn off the tap
Turn up the tap
Don't turn off the tap
Sell the tap
unfiltered water
filtered water
a pocket clock
a stopwatch
a watchstop
a watchout
Growing plants can teach about ____.
how plants grow
how to filter water
sorting waste
how to save electricity
a expired bag
a string bag
a reusable bag
a single-use bag
gavel
pebbles
gravel
bricks
plastic
Recycling relay can teach about _____.
sorting waste
planting trees
filtration
growing plants
filtration system
waste management system
desalination system
recycling system
compost
gravel
compose
filtration
firewood
gas
coal
charcoal