--Spacecraft "Discovery" has failed in the course of launch.
--_____? They have been preparing for the test.
| A．How come? | B．When | C．What for | D．Why not |
According to the psychoanalyst Sigmund Freud, wisdom comes from the _____ of maturity.
| A．fulfillment | B．achievement | C．establishment | D．accomplishment |
My camera can be _____ to take pictures in cloudy or sunny conditions.
| A．treated | B．adopted | C．adjusted | D．reminded |
Mr. Smith gradually _____ a knowledge of the subject.
| A．attained | B．achieved | C．required | D．acquired |
His new appointment takes _____ from the beginning of next month.
| A．place | B．effect | C．post | D．office |
It was a great _____ for him to be pleasant to people he didn't like.
| A．attempt | B．trouble | C．power | D．effort |