Kate and Alice are good friends. ________ often help each other.

—I want to know ______ your son is.—He is ten years old.

- Excuse me, may I keep the book a little longer?  - Sorry. You ________ return it today.

 --- Do you know his ________? --- No. I only know he lives in Hongqi Street. We can call him before we go to his house.

In summer, there is plenty of rain for the grass to grow.