These natural parks are very important for preserving many animals, which would _______ run the risk of becoming extinct.

—How did you save the drowning girl?—By using a _______.

I think whoever makes________contributions to the company than others should get________ income.

----Thank god, you finally returned home _____.----You can never imagine how I worried about you when I was told about the terrible accident.

I'm       about what I say because careless remarks are likely to hurt others' feelings.