Read each pattern and its example, then write your own sentence on the line.
〜を禁じ得ない N（感情を表す語）+ を禁じ得ない
'I cannot help feeling…' — a spontaneous emotion the speaker cannot hold back. Stiff written register; only with emotion nouns.
被災地の映像に涙を禁じ得なかった。 I could not hold back my tears at the footage of the disaster area.
〜を機に N + を機に（して）／を機として
'Taking X as an opportunity', where X is a turning point that prompts a positive change or new start. Slightly formal.
転職を機に、生活習慣を見直すことにした。 Taking my job change as an opportunity, I decided to review my lifestyle.
〜を境に N（時・出来事）+ を境に（して）
Marks a point in time as a dividing line: before and after it, the situation clearly changes. Neutral-to-formal, often written.
三十歳を境に、体力の衰えを感じ始めた。 From the age of thirty on, I began to feel my strength declining.
〜を踏まえて N + を踏まえて／を踏まえた + N
'On the basis of / taking X into account', where X is data, opinions or past experience used as a foundation for a decision. Business and academic register.
前回の反省を踏まえて、計画を練り直した。 Taking the lessons of last time into account, we reworked the plan.
〜をもって N（手段・時）+ をもって
Formal 'by means of' (method) or 'as of' (a set time at which something takes effect or ends). Typical of notices and ceremonies.
本日をもって、受付を締め切らせていただきます。 Applications will be closed as of today.
〜をものともせずに N（困難・障害）+ をものともせず（に）
'Undaunted by X' — someone faces a hardship or obstacle without letting it stop them. Written, admiring tone; not used about oneself.
荒天をものともせずに、船は出港した。 Undaunted by the stormy weather, the ship left port.