33．—There will be a talk show this time tomorrow．Would you go with me?
—I'm sorry, but I ______ an important meeting．

25．At present, the butter factory is still polluting the river though it ______ to stop.

As soon as he comes back, I’ll tell him when ________ and see him.

Great changes _______ in his hometown in the last twenty years.

The great union we had been looking forward to _______ at last.

There is a saying that      "Never put off until tomorrow what you can do today."

--- Pardon? I didn’t quite catch you.
--- I said our foreign guests        to Dalian the nigh before.

-You could have asked your teacher for help. She was free.
-Yes. A whole day___

-Did you come to the museum by bike yesterday?
-No. Two inches of snow fell during the night. As a result, several main roads___

As a senior student, I am determined to work harder in order to___the desired university.