to maintain communication with someone
поддерживать связь с кем-то (podderzhivat' svyaz' s kem-to)
"Even after moving away, we keep in touch regularly."
"Даже после переезда мы поддерживаем связь регулярно." (Dazhe posle pereezda my **podderzhivayem svyaz'** regulyarno.)
To do what you promised to do.
to be independent and self-supporting
to prepare for all possible situations
feeling sad or depressed
to perform extremely well on an exam or task
To keep something secret.
