You need to hire an office assistant. You want someone who will do a good job without being told what to do. You write the job description:
We're looking for a highly motivated, super-organized self-starter.
adjective, formal, hiring, job, personality 
You're explaining what your charity organization does at a street fair.
We provide assistance to disabled veterans.
You're going to apply to a school in the U.S. You're reading the rules for applying on the school's website. There's a sentence on the page which says:
Please note that all applications must be accompanied by two letters of recommendation.
One of your employees made a big mistake that cost the company a lot of money to fix. You need to find out what caused the mistake so that it doesn't happen again, but you don't want to blame the employee personally. In a staff meeting, you say:
We need to take an in-depth look at our process to determine how this managed to happen.
business, formal, hyphenated words, meeting, work 
You're on an airplane that is about to land soon. The flight attendant is making announcements. She says:
Seat backs and tray tables must be placed in their upright and locked positions.
You work at a clothing store. A customer looks like he's ready to check out. You want to offer to help him, so you say:
I can assist you with that.
Your company gives employees free shots to protect against getting the flu. You think everyone should get one so that they don't get sick. In a meeting, you announce:
I urge everyone to take advantage of the free flu shots being offered this week.
advice, formal, health, idioms, infinitive 
You're a teacher. You're teaching your class with a textbook. Some of the students are moving quickly through the textbook, while some are moving more slowly. You want to tell the slower students to answer some questions. You say:
Take a moment to answer those questions on page 13 if you haven't done so already.
classroom, formal, school, set phrase 
You're writing an essay for school about the city of Detroit. The city used to be rich and full of people, but now it's poor. You're writing about people who are trying to improve the city. You write:
People say that Detroit is long past its prime, but some still hold out hope that the city will revive itself.
city, formal, hearsay, idioms, phrasal verb, written English 
You are introducing a speaker at a conference. She is a well-known writer who has won awards. You're listing her accomplishments. You say one of the accomplishments on the list:
She is also the recipient of numerous awards, including the Pulitzer Prize for Nonfiction.
award, book, formal, introduction, speech, writing (topic) 