When he walked_______ my desk，he knocked my books________ the floor.
| A．passed；away | B．past；onto |
| C．passed；off | D．past；off |
—Sir，could you please put out your cigarette？This is a smoke-free(无烟的)school．
—________．
| A．I’m sorry about this． |
| B．Not at all． |
| C．Sure．I’d love to． |
| D．Never mind． |
Few people think about what they can do________others．
| A．to help |
| B．helping |
| C．to helping |
| D．help |
—What are they doing now？
—They are busy________articles in the room．
| A．to write |
| B．write |
| C．writing |
| D．to writing |
They decided________the homeless kids．
| A．to help |
| B．help |
| C．helping |
| D．to helping |
There are many trees on________side of the road．
| A．all |
| B．both |
| C．every |
| D．each |