____ to nuclear radiation, even for a short time, may produce variants of genes in human body.
| A．Exposed | B．Being exposed | C．Having exposed | D．After being exposed |
Unless ___ to speak，you should remain silent at the conference．
| A．invited | B．inviting |
| C．being invited | D．having invited |
When I came back, I found my clothes , on the bed.
| A．folded, lay | B．folded, lain |
| C．folding, lying | D．folded, lying |
We should take different measures different conditions and different occasions.
| A．on , in | B．under, on |
| C．under, at | D．in, on |
There are trees and flowers along both sides of the road______ our school.
| A．arranging | B．clarifying |
| C．leading to | D．spinning |
We will be back .
| A．in no time | B．at one time |
| C．at a time | D．all the time |