Would these sentences sound right?

Dear native English speakers,
would these sentences sound right?

(a) I found this book easy to read, written in simple English.
(b) Looking out of the window, the mountains were so beautiful.
(c) Walking in Hyde Park, it's hard to believe you're in the middle of a big city.
(d) People planted a lot of trees in their city, making it a better place to live.
(e) Being a holiday, we went shopping downtown.

Thanks in advance.

Hirashin