18．The car ______ halfway for no reason.
A．broke off  B．broke down
C．broke up  D．broke out

19．“Need we work late today?” “No, but we ______ tomorrow.”
A．need  B．must
C．can  D．ought to

20．______ might be expected, the response to the question was very mixed.
A．As  B．That
C．It  D．What

21．Mr. Morgan can be very sad ______, though in public he is extremely cheerful.
A．by himself  B．in person
C．in private  D．as individual

22．By the time he arrives in Beijing, we ______ here for two days.
A．have been staying  B．have stayed
C．shall stay  D．will have stayed

23．This kind of glasses manufactured by experienced craftsmen ______ comfortably.
A．is worn  B．wears
C．wearing  D．are worn

24．Floods cause billions of dollars worth of property damage ______.
A．relatively  B．actually
C．annually  D．comparatively

25．Americans eat ______ as they actually need every day.
A．twice as much protein  B．twice protein as much twice
C．twice protein as much  D．protein as twice much

II. 完形填空。从A、B、C、D四个选项中，选择一个正确答案，并填在答题纸相应的位置上。（本大题共15小题，每小题1分，共15分）
Choose the most likely answers to complete the passage from the words given. (15 points)

In the USA, 85% of the population   26   the age of twenty-one   27