(A) "make _______ the seaside" → "make for" means to head towards a destination
(B) "do _______ the fireplace" → "do without" means to manage without something
(C) "doing _______ our bedroom" → "do up" means to renovate or redecorate
(D) "trying _______ prove" → "trying to" is the correct infinitive form (try + to + verb)