The Gulf of Mexico (墨西哥湾) is being polluted seriously. That has affected _______ several hundred kinds of sea animals there. [ ]

Why didn’t you go to the party ?_______ an invitation, I would have gone to the party .

I found a story-book on the desk, it isn’t mine, it is ___,I think.

Do you know the boy ________ is sitting next to Jim? Yes. He is Jim’s friend. They are celebrating his ________ birthday.

Let Lin Tao and ________me, will you? They are my good friends,