It has been two years since my brother ________ the army.
A. joined in B. took part in C. joined
We have friends to help us fight against pollution, and trees are one of ________.
| A．themselves | B．they |
| C．their | D．them |
Now, people regard drinking tea ________ a culture more than a habit.
| A．as | B．by | C．of | D．with |
Our mother earth gives us ________ we need in our daily life.
| A．nobody | B．nothing |
| C．everybody | D．everything |
Three bridges ________ over the river five years ago.
| A．built | B．build |
| C．were built | D．are built |
We are happy to see our city is developing ________ these years than before.
| A．quickly | B．the most quickly |
| C．very quickly | D．more quickly |