As the immune system weakens, it loses the ability ________ illnesses.
| A．fighting | B．fought |
| C．to fight | D．to be fought |
We bought the big house with the saving we had _____ for several years.
| A．set off | B．set down | C．set aside | D．set about |
.Children often have very _____ imaginations.
| A．outgoing | B．elegant | C．shallow | D．vivid |
Employees in a chemical factory should be given _____ training in safety.
| A．ambitious | B．adequate | C．absurd | D．autonomous |
Fat on human beings is _____ in different ways.
| A．distributed | B．donated | C．reflected | D．abandoned |
On the annual International Volunteers Day, the world _____ the work of millions of people who give their time to help others.
| A．abolishes | B．accompanies | C．acknowledges | D．appeals |