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A. could
B. was
C. would
D. did
40. Among the many subjects in school, mathematics is probably the most _____, depending least on a student’s background and culture.
A. universal
B. abstract
C. arbitrary
D. concrete
41. As a _____ actor, he can perform, sing, dance and play several kinds of musical instruments.
A. flexible
B. versatile
C. sophisticated
D. productive
42. As a salesman, he works on a (an) _____ basis, taking 10% of everything he sells.
A. income
B. commission
C. salary
D. pension
43. As an excellent shooter, Peter practiced aiming at both _____ targets and moving targets.
A. stationary
B. standing
C. stable
D. still
44. As teachers we should concern ourselves with what is said, not what we think _____.
A. ought to be said
B. must say
C. have to be said
D. need to say
45. As the plane was getting ready to take off, we all _____ our seat belt.
A. tied
B. locked
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