_______ all the inventions have in common is ______ they have succeeded .
Animals are obviously __________ lower form of life than __________ man.
There are over 58, 000 rocky objects in __________ space, about 900 of which could fall down onto __________ earth.
Experts think that __________ recently discovered painting may be __________ Picasso.
I woke up with __________ bad headache, yet by __________ evening the pain had gone.
As is known to all, __________ People's Republic of China is __________ biggest developing country in the world.