—Do you have a knife?—Yes, I do. I have a big     . 

World Wetlands Day is on________.

---Is this your book ? ---No , I think it’s ______ . 

 People in the southwest of China are in great need of ______ this year because it hasn’t rained for a long time there.

I’m not sure about the meaning of the word. You’d better look it up in a ____ ．