What were you trying to prove to thepolice — I was last night

Every one of us must know this: _________ we live can we save the earth．

Jack used to ________ to school.—-Yes, but now he’s used to ________the bus.

It was Martin Luther King’s struggle ______ helped black Americans to get equal rights.[ ]

1． The meat is expensiveand eating meat is bad for yourhealth.