1.The brilliant blue waters (make, makes) the area popular.

2.Either Sydney, Australia, or Budapest, Hungary (were, was) settled by the British.
3.In Bahrain (is, are) located important oil reserves.
4.(More, Most) of the world's population (is, are) in Asia than anywhere else.
5.Citizens of the Ivory Coast in West Africa (have, has) enjoyed prosperity and pace.

1.make
2.were
3.are
4.Most, is
5.has

1 and 3 are correct.

You're slipping.

Only 1 and 3 are correct.

http://grammar.ccc.commnet.edu/grammar/sv_agr.htm

See #s 3 and 4.

2.was

4.Most, is
5.have

4. Most is used to compare three or more things. In this sentence, only Asia and the rest of the world are compared.

To determine the correct verb form in each sentence, you need to consider subject-verb agreement. Here's the breakdown for each sentence:

1. The subject "brilliant blue waters" is plural, so it requires the plural form of the verb "make." Therefore, the correct verb form is "make."

2. The subject "Either Sydney, Australia, or Budapest, Hungary" is singular, despite having multiple options listed. Therefore, it requires the singular form of the verb "was." Therefore, the correct verb form is "was."

3. The subject "important oil reserves" is plural, so it requires the plural form of the verb "are." Therefore, the correct verb form is "are."

4. The subject "Most of the world's population" is singular, despite referring to a large number. Therefore, it requires the singular form of the verb "is." Therefore, the correct verb form is "is."

5. The subject "Citizens of the Ivory Coast in West Africa" is plural, so it requires the plural form of the verb "have." Therefore, the correct verb form is "have."