在平面内,若直线a⊥c,直线b⊥c,则a∥b;在空间中,若直线a⊥c,直线b⊥c,则直线a与直线b不一定平行。这说明:
His dictionary is ______ in our class.
Think it over, ______ you’ll work out the math problem.
Jim often goes to school _____ bike. He likes cycling very much.
Spud practiced even _______ and _______ the coach to change his mind.
— Could you tell me _______? — Call me Jack, please.