(business) initiative

extreme regret

to travel along a specific route / to have contact with other people, to engage in social intercourse

passage through an object / passage of a test in school / passage of a bill / passage through a screening

currency

general rule

mastery, proficiency, expertise / semenarche, first ejaculation during puberty

to be well versed (in), to have expertise, to be well acquainted (with)

circulation (of money or information) / distribution

circulate / distribute / be negotiable