Q: Keywords: cross, environment, flow, summer, waterfall
What is a sentence that includes all these keywords?

A: waterfalls flowing in idyllic uncontaminated environment crossing green meadows and boulders in summer

Q: Keywords: car, discount, sign, symbol
What is a sentence that includes all these keywords?

A: car with percent sign as symbol for discounts when buying a car

Q: Keywords: front, panel, turn
What is a sentence that includes all these keywords?

A:
Pacing in front of a long control panel, Stark turns a dial.