----How terrible the air is!Yes,if there are ___trees, there will be ___air pollution in our city.
—Why didn’t you answer my phone call, Jack? —I’m sorry, but I ________ then.
Please hope on you dream ______ one day it comes ture.
The little boy ________ his seat to an old lady on the crowded bus.
There is ______ American boy in our class and ______ boy can speak good Chinese .
---- Can you tell me why __________? ---- Because I want to help the people there. A. do you go to Tibet B. did you go to Tibet C. you are going to Tibet