_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in bodies.
| A．Being exposed |
| B．Having exposed |
| C．Exposed |
| D．After being exposed |
The book, which ______ children, became popular with adults.
| A．was planned for | B．was meant by | C．was intended for | D．was designed by |
Measures have to be taken to teach young people how to ______ themselves both in family and in school. They don’t know the basic manners. 
| A．do | B．perform | C．behave | D．work |
He was charged with ______ robbery and now is being questioned in relation to it.
| A．advised | B．attended | C．admitted | D．attempted |
She went to the supermarket and ______ what she needed, she returned home, light-hearted.
| A．bought | B．having bought | C．buying | D．to have bought |
. ______ the question made her teacher angry and upset.
| A．Jenny refuses to answer | B．Jenny refusing to answer |
| C．Jenny’s refusing to answer | D．Jenny’s refusing answering |