Sentence completion with contrast: infer a positive trait from an unsmiling appearance Base stem: "His appearance is unsmiling but …" Choose the clause that best contrasts the outward look with an inner quality.

Given data

• Contrast marker: "but".
• Appearance: "unsmiling" (neutral/negative surface cue).

Concept/Approach
A "but" clause should meaningfully contrast the first clause. The most logical contrast to an unsmiling exterior is a warm or kind interior quality.

Option analysis
his heart is full of compassion for others — clear positive inner trait that contrasts surface sternness. ✅he looks very serious — repeats the same idea; not a contrast.people are afraid of him — consequence of unsmiling; not a contrast.he is uncompromising / full of jealousy — negative traits; again not a contrast.

Final Answer
his heart is full of compassion for others.