Do you know Earth Day?－Sure, it _______ in 1970 to tell us to protect our earth.

Do you know the man is sitting behind Nancy?—Oh, he’s my Chinese teacher, Mr Zhou．

What’s your father doing now? –He ______ the room

On the way home, Tracy found a purse _____ accident. [ ]

Though I go to the beach _ _, I still want to go again.[ ]