Definition: If a type of animal is extinct, it does not now exist. Level: C1
这些生物可能很快就会灭绝。
These creatures could soon be ___extinct.
人类活动导致许多物种灭绝。
Human activities have made many species ___extinct.
恐龙已经灭绝了数百万年。
Dinosaurs have been ___extinct for millions of years.
