Writing & Grammar: Confusing Words for 700

I've talked about assure, ensure, and insure in the past, but I think these supremely confusable words deserve a reprise.

Assure–to tell someone not to worry, is the way I think of it, as in the word reassure. This is also the word that the term quality assurance is based on. Here, I think of it as a process that allows a company to assure customers that the product is of high quality.

The postal clerk assured me that the package would arrive on time.

Ensure–to make sure or to make certain. This verb is the one you want when you ask a student to double-check something:

The clerk ensured that the correct zip code was printed on the label.

Please ensure that the checkbox is selected, then click the OK button.

Insure–You are safest in usage on this one if you are talking about purchasing insurance. However, the U.S. military tends to use this also as a synonym for ensure.

All of the specific usage I am discussing here goes beyond what descriptive dictionaries, such as Merriam Webster's, indicate. I found their differentiation of these terms to be too vague, compared with the standards I have typically been asked to follow when doing professional copyediting. So to be precise, make the distinctions indicated here.

Here's a second set of confusing words: comprise/compose/constitute.

Comprise–just memorize that the phrase is comprised of is always wrong. The larger thing comprises the parts, or draws them together:

The monument comprises a stone obelisk and a colonnade.

Compose–to make up. Is composed of is correct:

The monument is composed of two parts: a stone obelisk and a colonnade.

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This Week's Challenge: Which is correct? 

1. We ensured/insured the ring for $3,000 after the jeweler apprised/appraised its/it's value.
2. He told the participants to ensure/insure that their computers were logged out after the class.
3. He also ensured/assured them that their files would not be erased.
4. The new app is composed of/is comprised of two parts.
5. The new app composes/comprises two separate parts, both of which are better than/then competing online services.
6. Ensure/insure/assure that the dialog box is closed before exiting the program.
7. The training program is comprised of/is composed ofdemonstrations, exercises, and quizzes.
8. The individual programs of which the suite is comprised/of which the suite is composed/which the suite comprises are also available as stand-alones. 

Feel free to post your answers below as comments.

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