Here are some concepts: bridge, cross, park

What is a sentence about these concepts?

Sentence is below.
People cross a little stone bridge at the park.

Here are some concepts: cloud, hide, rise

What is a sentence about these concepts?

Sentence is below.
mountains rising behind a lake are hidden by cloud .

Here are some concepts: create, reaction, scientist

What is a sentence about these concepts?

Sentence is below.
A scientist is creating a chemical reaction.

Here are some concepts: cake, celebrate, year

What is a sentence about these concepts?
Sentence is below.
A homemade cake celebrating "50" years of something special.