—How much shall I pay for the food?
—You .This is free of charge.
| A．mustn’t | B．needn’t | C．shouldn’t | D．couldn’t |
The number of tickets _____ will be determined by the size of the stadium.
| A．adaptable | B．acceptable | C．advisable | D．available |
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．remedied |
This is the _____ piano on which the composer created some of his greatest works.
| A．actual | B．genuine | C．real | D．original |
Mr. Smith gradually _____ a knowledge of the subject.
| A．attained | B．achieved | C．required | D．acquired |