In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Q: Sentence: Soluble metal hydroxides is produced by the reaction of metal oxide with water. Question: What is produced by the reaction of metal oxide with water?

A: soluble metal hydroxides
****
Q: Sentence: Ions that contain fewer electrons than protons have a net positive charge and are called cations. Question: Ions that contain fewer electrons than protons have a net positive charge and are called what?

A: cations
****
Q: Sentence: A waterfall a stream flows from a hard to  soft rock area, what is often formed. Question: When a stream flows from a hard to  soft rock area, what is often formed?

A:
a waterfall
****