How long should a cover letter be?

One page, three to four short paragraphs. Long enough for one real example, short enough to read in a minute.

What if I don't have the hiring manager's name?

Use Dear Hiring Manager, or Dear [Team] Team if you know the department. Avoid To Whom It May Concern, which reads as outdated.

English for work

A cover letter in English is short, direct and specific to the job. Four parts, phrases for each, and a few traps to avoid.

Cover letter phrases
Part	Purpose	Useful phrases
Opening	State the role	I'm writing to apply for... / I came across the [role] position and...
Why you	Connect your experience	In my current role, I... / I have X years of experience in...
Why them	Show real interest	I've followed [company]'s work on... / What draws me to this role is...
Closing	Invite next steps	I'd welcome the chance to discuss... / Thank you for considering my application.

Spanish cover letters often open with a formal, generic greeting and build up slowly. English readers expect the role and your fit in the first two lines.
Keep it to one page, three to four short paragraphs. A long cover letter reads as unfocused, not thorough.
Avoid I think I would be a good fit without a reason. Replace it with a specific example that proves it.
A quien corresponda becomes Dear Hiring Manager if you don't have a name, not To whom it may concern, which now sounds dated in most industries.

Gap fill and key word transformation

Complete each sentence with the natural English. In the last one, use the word in capitals.

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How long should a cover letter be?: One page, three to four short paragraphs. Long enough for one real example, short enough to read in a minute.
What if I don't have the hiring manager's name?: Use Dear Hiring Manager, or Dear [Team] Team if you know the department. Avoid To Whom It May Concern, which reads as outdated.

Book a trial class. She writes back with times in Buenos Aires time.