— Can I help you, boy?— Yes. There is ______ wrong with my bike.
--What do you think of your math teacher?-- He is kind, he looks serious.
-–- I wonder if he to see us tomorrow.---I’ m sure if he , he will bring us some wonderful gifts.
—It’s smoggy these days. That’s terrible!—Yes, I hope to plant trees. ______ trees, ______air pollution.
School students ________ smoke because it is against the school rules.
_____ great fun it is to make a snowman in winter.