My friend................. to help with the cleanup campaign to keep our streets clean.
stayed at home
signed up
You don't need to worry.
I'll do it.
Never mind.
We shouldn't ..............................energy.
use
waste
A supervolcano can cause .............................................
harm to Vietnam.
worldwide damage.
Sorry, but I'm working on something and I can't do anything else.
I'm spending my free time playing games.
I'm busy.
African elephants are a(n) __________. We need to protect them.
endangered species
a funny species
They .................... this new campaign about using the 3Rs to reduce garbage in landfills.
volunteered for
volunteered to
He doesn't drive to work. He uses __________ instead.
a spaceship
public transportation
If global warming continous birds will lose............................
their new iphones and ipads.
their habitat.
Kathy signed up for the soccer team this year.
Kathy volunteered to help the soccer team this year.
Kathy put her name down to join the soccer team.
We could ask them to come with us, too.
They can't come with us.
They can join in.
If a(n) .........................wakes up, then there will be an eruption.
active volcano
sleeping volcano
Dinosaurs are ............................. animals.
endangered
extinct
You should ......................... made of paper or plastic to reduce the amount of garbage that we all produce.
throw out objects
volunteer to recycle objects