．—I called you yesterday. A woman answered, but I didn’t recognize her voice.
—Oh, it _____ my aunt Jean.
| A．must be | B．must have been | C．might be | D．can have been |
It is not right for some young people to live a life of absolute dependence ______ their parents.
| A．of | B．on | C．from | D．in |
The woman _____ her boss of having broken the labor law because he fired her when she was pregnant.
| A．blamed | B．charged | C．accused | D．scolded |
The business of the company was growing so fast that the manager had to _____ more workers.
| A．take in | B．take on | C．take up | D．take after |
However, at times this balance in nature is disturbed, ____ a number of possibly unforeseen effects.
| A．lying in | B．calling in | C．existing in | D．resulting in |
China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
| A．where | B．which | C．on which | D．after which |