Mum，do you know where my Dad is—I don’t know. Perhaps he ________ trees now.

______ of money spent on the bridge.

Why not try your luck in the library That’s ________ the American classical books are kept.

I joined in the 2017 Nanjing Marathon (马拉松) race, __________ I couldn’t run as fast as a real athlete.—That’s really great! You are my hero!

Water is a liquid which has no color _______ you wash your hands in it, then it turns black.[ ]