Answer the questions at the end based on the text.

The terms upper case and lower case can be written as two consecutive words, connected with a hyphen (upper-case and lower-case), or as a single word (uppercase and lowercase). These terms originated from the common layouts of the shallow drawers called type cases used to hold the movable type for letterpress printing. Traditionally, the capital letters were stored in a separate case that was located above the case that held the small letters, and the name proved easy to remember since capital letters are taller. 

The convention followed by many British publishers (including scientific publishers, like Nature, magazines, like The Economist and New Scientist, and newspapers, like The Guardian and The Times) and U.S. newspapers is to use sentence-style capitalisation in headlines, where capitalisation follows the same rules that apply for sentences. This convention is usually called sentence case. It may also be applied to publication titles, especially in bibliographic references and library catalogues. Examples of global publishers whose English-language house styles prescribe sentence-case titles and headings include the International Organization for Standardization.

1. Is sentence case a requirement or a convention?
2. What titles might it be applied to?
3. Especially in which type of references?
4. And also, what type of catalogues?
5. What organization does ISO stand for?
6. Are they a global publisher?
7. Do they have an English language house style?
8. What must their titles and headings use?
9. How many words can the terms upper and lower case be written as?
10. What can they be connected with?
11. Were the drawers deep?
12. What was stored in the drawers?
13. What were they called?
14. Were capital letters stored in the same type case?
15. Where was its case located?
16. Are capital letters taller or shorter?
17. What country initially followed this convention?
18. What type of publisher was Nature?
19. What kind of publication was The Guardian?
20. What's another newspaper that used this convention?

Numbered answers:
1. Convention
2. Publication
3. Bibliographic references
4. library catalogues.
5. International Organization for Standardization.
6. Yes
7. Yes
8. Sentence-case
9. Twi
10. A hyphen
11. No
12. Movable type for letterpress printing
13. unknown
14. No
15. Above the case
16. taller.
17. Britan
18. Scientific
19. Newspaper
20. The Times