There ________ lots of trees on both sides of this street.But now they are all gone.
We have friends to help us fight against pollution, and trees are one of ________.
Now, people regard drinking tea ________ a culture more than a habit.
Our mother earth gives us ________ we need in our daily life.
Three bridges ________ over the river five years ago.
We are happy to see our city is developing ________ these years than before.