Life is___,but there is no limit_____.
| A．limited，to learn | B．limit，to learn |
| C．limited, to learning | D．limited，of learning |
Please don't ______ him. He is quite ______ about his girlfriend's words right now.
| A．disturb; disturbing | B．disturbed; disturbing |
| C．disturb; disturbed | D．disturbing; disturbed |
The drug did not ______ his health. In fact，it seemed to have no ______ at all.
| A．effect; effect | B．effect; affect |
| C．affect; effect | D．affect; affect |
Many young graduates devoted dozens of years to ______ success in life.
| A．seeking | B．searching |
| C．suggesting | D．wondering |
For years scientists have been worried about the ______ of air pollution on the earth's natural conditions.
| A．effect | B．result |
| C．account | D．cause |
Don’t be angry with us. We ____ with you together, but we were busy with our final reports when you called in.
| A．would eat out | B．must have eaten out |
| C．should eat out | D．could have eaten out |