There were no tickets () for Sunday's performance.
A. possible
B. probable
C. available
D. feasible
The storm caused severe damage()
A. physical
B. accidental
C. serious
D. enviromental
A new system of quality control was brought in to overcome the defects in the firm's products.
A. invested
B. introduced
C. installed
D. insisted
But from the start of their experiments, the Wright brothers found that they needed money to pay () their research.
A. back
B. down
C. for
D. off