______ is very difficult.

--- Did the book give the ___________ you needed?--- Yes. But ____________ it, I had to read the whole book.

 --- Would you like to collect _____ with us in the park this Saturday?--- Yes, I’d love to. Let’s make it clean.

— How is the _______ in Tiandong?— It’s getting worse and worse. There are always long lines of cars on roads.

—Did you go to the Old People’s Home yesterday?  —Yes. I am a __________ of our school. I like helping people.