Have you heard of Earth Day ?—-Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .

Tom took the police to the spot ____ the accident happened．

________, what she had devoted herself to resulted in nothing but failure.

Look at the girl in the red skirt. ______is my new classmate.

Oh, my God! I can ______ put on my trousers. I must be getting heavier.