Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.
| A．can; have to |
| B．may; can |
| C．have to; may |
| D．ought to; must |
Fred, who had expected how it would go with his daughter, had a great worry ______ his mind.
| A．in | B．on | C．with | D．at |
The cost of living in Glasgow is amon
g the lowest in Britain, ____ the quality of life is probably one of the highest.
| A．since | B．when | C．as | D．while |
—Why did you arrive late?
—The fog _____ our air flight for about half an hour.
| A．held up | B．turned down | C．broke up | D．pulled down |
Jerry had worked hard for his chemistry examination so that he could be sure of passing it at his first_____ .
| A．assumption | B．appetite | C．attempt | D．accumulation |
—Did you see ____ may be the longest total solar eclipse (日全食) in 500 years yesterday?
— No, it was cloudy above my city at that time.
| A．what | B．who | C．which | D．that |