Polar bears are losing their __________ as ice is melting at a shocking rate.

Only after I __________ this math problem can I start to solve it.

n. 水族馆

When you're writing to apply for a job, please use __________ language.

What's this?

v. 促使，引起

He __________ knocked the glass off the table just for fun.

The disappearance of an insect or a frog may not seem very important, but every animal is an important __________ in nature.

Cheetahs are considered an __________ species, facing a high risk of extinction in the wild. Their global population is estimated to be fewer than 7,000 mature individuals and continues to decrease.