One very important aspect of human relationship is … trust.

Analyze the question The sentence is: "One very important aspect of human relationship is __ trust." We need the adjective that best describes trust between people in a relationship.

Explain the concept The key word is relationship, which involves two or more people. The word that fits is one that shows something shared or reciprocated between them.

• Communal: belonging to a whole community or group (e.g., communal land). It doesn't fit a relationship between individuals.
• Individual: concerning one single person. This contradicts the idea of a relationship.
• Mutual: felt or done by both sides equally (e.g., mutual respect, mutual understanding). This fits.
• Personal: belonging to one particular person (e.g., personal opinion). It doesn't show two-way trust.

Solution In a good relationship, each person trusts the other. That two-way trust is called mutual trust. It is also a common collocation in English: mutual trust, mutual respect, mutual benefit.

Answer: C. mutual

Exam tip When you see words like relationship, agreement, understanding, respect, or trust between people, think of mutual. Remember: mutual = both sides.