American women usually identify their best friend as someone ________they can talk frequently.
| A．who | B．about which | C．as | D．with whom |
After a short holiday, he _____ himself once more to his studies.
| A．applied | B．converted | C．engaged | D．exerted |
The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
| A．set up | B．put down | C．keep up | D．lay down |
| A．managed | B．succeeded | C．arranged | D．convinced |
Keys should never be hidden around the house since thieves _____ know where to look.
| A．virtually | B．variously | C．unavoidably | D．invariably |
The Department is also deeply _____ in various improvement schemes.
| A．connected | B．included | C．involved | D．implied |