16. The government must take ____ action against environmental pollution.
A. important B. unstable C. decisive D. soft
17. My teacher always gives me advice ____ suitable career in the future.
A. choosing B. to choose C. choose D. not to choose
18. We're ____ to announce that you were selected to be our new faculty manager.
A. happily B. unhappy C. happiness D. happy
19. It is unnecessary for ____ to do this task. It's not ours.
A. we B. us C. they D. our
20. The chef tastes the meat ___________ before presenting it to the Minister.
A. cautious B. more cautious C. cautiously D. much cautious