The theory _____ by Einstein was later to prove true, but at that time few people could accept it .

ggest problemfor most plants, which ______ just get up and run away when threatened, is thatanimals like to eat them

Not only his parents but also his brother _______ to the Great Wall. They haven’t been back.

That was _____ time when girl’s education was always placed ____ second to boy’s.

His report was so exciting that it was_____ interrupted by applause (掌声)[ ]