Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
I am afraid that our plan won’t be passed at the meeting because the majority of the members are said to _______it.
Children growing up in a single parent family ______ to beaggressive and ill-tempered.
_____many times, he finally understood it.
Every year _____ money and energy is spent on environment protection.
I am not appealing for myself. I am appealing ________ all the ordinary teachers.