Select the most appropriate word to fill in the blank and make a meaningful sentence.

The doctor advised him to consume ............ water without any additive.

plain

The most appropriate word to fill in the blank is plain.

The word "plain" means "unadulterated or simple." This is the most appropriate word because it accurately describes how the doctor advised the person to consume water that is not mixed with anything else.

The other options are not as appropriate.

• Pleasant means "agreeable or enjoyable." This does not make sense in the context of the sentence, because the doctor is not advising the person to consume water that is pleasant to the taste.
• Potent means "having a strong or powerful effect." This does not make sense in the context of the sentence, because the doctor is not advising the person to consume water that is strong or powerful.
• Precious means "of great value or worth." This does not make sense in the context of the sentence, because the doctor is not advising the person to consume water that is valuable or worth a lot of money.