Walking alone in the dark, the boy whistled to ________ his courage.
| A．hold up | B．keep up | C．set up | D．take up |
According to the law, all foreigners have to ______ with the local police within two weeks of arrival.
| A．associate | B．dispute | C．negotiate | D．register |
While intelligent people can often ______ the complex, a fool is more likely to complicate the simple.
| A．sacrifice | B．substitute | C．simplify | D．survive |
Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.
| A．difference | B．comparison | C．connection | D．barrier |
Poetry written from the ______ of the urban youth tends to reveal their anxiety over a lack of sense of belonging.
| A．perspective | B．priority | C．participation | D．privilege |
An artist who was recently traveling on a ferry to the southern island discovereda long lost antique Greek vase.
| A． | at random | B． | by chance | C． | in turn | D． | on occasion |