16. According to recent reports, one of the rare animals, _____ crocodile, will be in danger of dying out in _____ 2020s.
A. a; 不填 B. the; the C. the; 不填 D. 不填; the
17. She keeps a supply of candles in the house in case of power _____.
A. absence B. lack C. failure D. drop
