READING TOPIC: HEALTH

His ______________ smile made it hard to tell whether he was joking or being serious.

• enigmatic

• essential

• sincere

• pleasure-inducing

Babies often smile as a ______________ response, just like blinking or breathing.

• primate

• reflex

• sincerity

• postulate

A ______________ is a type of mammal that includes monkeys, apes, and humans.

• sincerity

• non-aggression

• primate

• infectious

Laughter and smiling can have ______________ effects, helping to reduce stress and improve mood.

• therapeutic

• mischievous

• mysterious

• beaming

The scientist ______________ that human behavior is influenced by both genetics and environment.

• reflexed

• postulated

• evolved

• grinned

A genuine smile is often a sign of ______________ and true happiness.

• sincerity

• non-aggression

• evolution

• infectious

Her ______________ smile showed how happy and proud she was.

• enigmatic

• transformative

• beaming grin

• pleasure-inducing

The idea of ______________ suggests that living things change over time to adapt to their environment.

• sincerity

• primate

• evolution

• reflex

His laughter was so ______________ that soon, everyone in the room was laughing too.

• mysterious

• mischievous

• infectious

• pleasure-inducing

Some scientists believe that smiling is ______________ for mental and emotional well-being.

• therapeutic

• essential

• mischievous

• transformative