48. Be here on Friday _____ the latest.
A. at
B. by
C. for
D. in
49. Because the whole country is in a financial dilemma， the government calls on us to _____ economy.
A. make
B. practice
C. carry
D. develop
50. Before he started the work， I asked the builder to give me an _____ of the cost of repairing the roof.
A. assessment
B. estimate
C. announcement
D. evaluation
51. Beryl hardly ever goes to _____ the cinema.
A. neither the theatre or
B. either the theatre nor
C. neither the theatre nor
D. the theatre or
52. Beside being expensive， the food tastes _____.
A. badly
B. too much bad
C. too badly
D. bad
53. Britain‘s press is unusual _____ it is divided into two very different types of newspaper： the quality press and the popular press.
A. in how
B. in what
C. in which
D. in that
54. By moving the radar beam around slowly in circles， we can _____ the surroundings.
A. explore
B. expose
C. exploit
D. expand