With the living environment becoming worse and worse, many of the earth’s species are ______.

Everyone here will thank the firefighter forthe things they have done to prevent fires______the environment safer.

Anna spends one hour a day _____spoken English.

You have helped me a lot. I can’t thank you enough.—______.

I don’t like mutton ________ beef.—I don’t like mutton, ________ I like beef a lot.