of them has known about this because it has been already reported on TV.
| A．Each one | B．Everybody | C．Everyone | D．Every one |
Taking our own bags when _______can help protect the environment.
| A．shop | B．shopping | C．shops | D．shopped |
________is helpful to our environment.
| A．Cutting down trees | B．To protect animals |
| C．Not riding in cars | D．Recycle paper |
We ________ cross the street until the traffic lights turn green.
| A．mustn't | B．needn't | C．should | D．might |
You look too tired. Why not ________ a rest?
| A．stop having | B．to stop having | C．stop to have | D．to stop to have |
Let's ________ the TV to watch the news program.
| A．turn on | B．turn down | C．turn up | D．turn off |