23.Bob isn't __, but he did badly in the final exams last semester.
A.gloomy
B.dull
C.awkward
D.tedious
24.My tutor, frequently reminds me to ___ myself of every chance to improve my English.
A.assure
B.inform
C.avail
D.notify
25.Fashion designers are rarely concerned with vital things like warmth, comfort and __
A.stability
B.capability
C.durability
D.availability
26.Optimism is a ___ shown to be associated with good physical health, less depression and longer life.
A.trail
B.trait
C.trace
D.track
27.The newly-elected president is determined to __ the established policy of developing agriculture.
A.go for
B.go on
C.go by
D.go up
28.I am so busy that I only go home to visit my folks once in a blue moon.The italicized phrase means __
A.rarely
B.barely
C.now and then
D.one a year
29.A man's worth lies not___ in what he has as in what he is.
A.so much
B.much so
C.too much
D.much too
30.It is well known that knowledge is the __ condition for expansion of mind.
A.incompatible
B.incredible
C.indefinite
D.indispensable