He always lacks enthusiasm in work，and he's never ________a job for longer than a few weeks.
| A．held down |
| B．held up |
| C．held off |
| D．held on to |
He loved his family, but seldom _______ spend much time with them.
| A．was he able to | B．he was able to |
| C．is he able to | D．he is able to |
A study shows that walking fast in your old age is a ______ that you will live a long life.
| A．sign | B．mark | C．symbol | D．signal |
— Where _______ you put my dictionary?
— I left it on your desk when you _______ to Tom.
| A．did; spoke | B．have; were speaking |
| C．had; were speaking | D．had; spoke |
Raising children is said to be a job _______ parents receive the least formal training.
| A．in which | B．for which | C．where | D．to what |
_______ blood if you can and many lives will be saved.
| A．Giving | B．Give | C．Given | D．To give |