They ________ extensive and possibly dangerous actual flight training.
A. undertake
B. undergo
C. underplay
D. underuse
Don’t trust everything ________ you have read in the newspapers.
A. which
B. that
C. as
D. what
It is difficult to understand this kind of _______ calculation.
A. intricate
B. varied
C. indispensable
D. equable
—Why didn ’t you buy a new car?—I would have bought one if I _______ enough money.
A. had
B. have had
C. would have
D. had had