Here are some concepts: buy, need, remember

What is a sentence about these concepts?

Sentence is below.
i need to remember to buy colored envelopes next time .

Here are some concepts: classroom, school, teacher

What is a sentence about these concepts?

Sentence is below.
classroom with students and teacher in a rural school

Here are some concepts: hack, home, room

What is a sentence about these concepts?

Sentence is below.
hacks to having a hotel room at home

Here are some concepts: cover, folder, study

What is a sentence about these concepts?
Sentence is below.
He slides one of two folders atop the desk toward himself and studies the cover.