The conservation area is very important for preserving many animals and plants, which would ______ run the risk of becoming extinct.

I  , but my mother didn’t   .

 When you feel you are happier and more relaxed after having a cigarette, you may become ________addicted.

The volcano eruptions are found ________around the Pacific ocean.

— You keep on coughing. What’s the matter? —  Oh, I’ve got a cold. Nothing serious, ____.