Explanation

Lawrence Kohlberg is known for his theory of moral development, a key part of normal human development.

He outlined six stages within three levels of moral reasoning:

1. Pre-conventional
2. Conventional
3. Post-conventional

Explanation

In a structured interview, the interviewer follows a fixed set of pre-determined questions.

This approach ensures consistency and comparability across different interviews.

Explanation

The child-centered method encourages participation, freedom, and respect, promoting democratic values.

It focuses on the learner’s interests and active involvement rather than just teacher direction.

Explanation

"Any" is used in negative sentences to refer to an unknown quantity.

Since he couldn't find milk, "any" correctly fits the negative context.

Explanation

"Either" refers to one of two options, so it takes a singular verb.

Therefore, "is" agrees correctly with the singular subject "Either answer."

Explanation

"Worth seeing" correctly describes something valuable or interesting to look at.

The structure "a site worth seeing" is grammatically correct and commonly used.

Explanation

"A" is used before a singular, countable noun when mentioned for the first time.

"A letter" fits because it refers to one unspecific protest letter.

Explanation

"As well as" introduces extra information that modifies the main subject.

The verb agrees with the main subject only, which is singular ("The player").

Therefore, the singular verb "wants" is correct.

Explanation

"Bread and butter" is treated as a single combined item (a food staple).

Therefore, the singular verb "is" is used to indicate its essential nature.

Explanation

"The environments" refers to specific natural settings already known or implied.

Use of "the" is proper when talking about general threats to particular environments.