His brother won’t go to play basketball until his work        .

---Be careful. You might fall into the river.
---Thank you. I ________ I ________ so close to it．

Mary, along with her parents ________ Hainan for a week and they will come back soon.

—Tom wants to know if you ___ a picnic next Sunday.
—Yes. But if it ___， we'll visit the museum instead.

— Mr. Lee ____ to a student when I entered the classroom this morning.
-- He is very patient ____he is young.

These new clothes _____ to the children in the mountain villages tomorrow.

—The population of the world ____ still ____ now.
—So it is.
A. are; growing       B. will; grow        C. is; growing

—It smells terrible. What has happened here?
—Look, there is a chemical factory_____ much waste gas.
A. pour        B. pouring      C. poured  

—Where are Maria and Kangkang?
—They _____ England.
A. had been in  B. have gone to     C. have been to

All the students _____two groups by the teacher during the competition.