高一英语翻译（按要求）

By the time he was fourteen years old, he built a laboratory for
himself.
We have learned over 2000 words with time .
It is not a easy thing to follow instructions in a way.
This room is big enough to hold less than 50 people.
He likes popular music in common with most youngsters.
As time going on, my memory power, just like a heffalump, develops so quikly that I would never forget any thing of myself.