b) Write and tell your group. (name) had travelled by plane by the time he/she was 6.

Explanation:

This is a fill-in-the-blank activity for a speaking exercise. The sentence structure uses the past perfect tense to describe an action completed before a specific point in the past (when the person was 6 years old). The user needs to replace '(name)' with a name and potentially rephrase the sentence to fit a real-life scenario or imagination.

Example completion:

• Maria had travelled by plane by the time she was 6.