a perfect pair

responsibility rests where it belongs

very obvious

The few can't fight the many

know each other

Strike out a new path for oneself

act wilfully and unscrupulously(behave recklessly)

be nearing exhaustion

play bopeep

hang back

orderliness

ask every passerby how to build one's house(have no idea or plan of one's own and accomplish nothing)

go downhill(hit the skids)

be the founder or originator of something(initiate something without depending on the predecessors or precedents)

self-appreciation(self-appreiation)

bend over old books(bury oneself in outdated writtings)

Consistent from beginning to end

Lofty mountains and high ranges

see 正经八百

Dog-eat-dog