This is the best way ______ I have thought of ______ the problem.
A．that; solving B．in which; solving
C．which; to solve D．/; to solve
Particular attention must be paid ______ welfare, especially in the poor area.
A．develop B．to develop C．to developing D．developing
At this time tomorrow ______ over the Atlantic.
A．we’re going to fly B．we’ll fly
C．we’ll be flying D．we’re to fly
—That must have been a lot of work.
—Yeah, it us three days to finish it.
A．takes B．had taken C．took D．was taking
______ many times, he finally understood it.
A．Told B．Telling C．Having told D．Having been told
Going on a trip into ______ space must be quite ______ exciting experience.
A．/ ; the B．/ ; an C．the; an D．the; a
