1 of

2 ~'s (possessive particle)

3 (used after an attribute)

4 (used to form a nominal expression)

5 (used at the end of a declarative sentence for emphasis)

1 to exchange

2 exchange

3 communication

4 interaction

5 to have social contact (with sb)

1 official (in an organization or government)

2 administrator

1 government

2 official (approved or issued by an authority)

1 dozen (loanword)

1 don't do it, or don't rest (idiom); either give up, or go through to the end

2 Since we started, we must carry it through whatever happens.

3 in for a penny, in for a pound

1 lit. when a man achieves the Dao, his poultry and dogs rise to Heaven (idiom)

2 fig. to ride on sb else's success

3 Once one man gets a government position, all his cronies get in too

4 Once sb has cracked the problem, every Tom, Dick and Harry can do it

1 to live miles apart (idiom)

1 news pass quickly from mouth to mouth (idiom)

2 an infectious disease spreads quickly (old meaning)

1 happy on the one hand, but worried on the other (idiom)