We should____(be)careful.
We should____(be)careful.
We must ___(be) careful.
We must be careful.怎么改祈使句
We must___(be) careful with fire.
We have to be careful how we c_______ people.
So we must be careful when we use the Internet.
We should be careful when we ___a busy street
We must be careful when we( )the road.
we should be careful not to (养成)bad habits
填空 we must be careful when we___ the road
When a shark ______(appear),we should be careful
knowing how valuable friendship is,we should be very careful