______results show that the tank is not leaking, but this has to be confirmed by further medical trials.
A. Predominant
B. Preliminary
C. Preferable
D. Precious
Were working______the clock to accomplish the proposal before Tuesday.
A. after
B. before
C. against
D. forward
Nowadays teenagers are not______to stand and appreciate works of art; they prefer to participate in them.
A. content
B. controversial
C. confident
D. conspicuous