Three different questions

1. Can you check the sentences please? Are they correct?

He will go hiking up the mountain.

I have a good appetite.

I am afraid of getting fat.

The movie's name is "Yellow River."

2. As to the sentence below, do you think I need to put the article "the" before the word "words." I think so because the context of the sentence is such that the person in the first person (ie, "i") must memorize certain words that he/she has a preconceived idea of. In other words, that person already have certain words that he want to memorize in his/her mind so the inclusion of the definite article "the" is necessary. What do you think?

I must memorize (the ????) words.

3. I think the two sentences below can use the word "the" in the places indicated, if not they are a must for the sentences. What do you think?

Over and over we are given (the ????) examples of the fruit of wisdom and the fruit of foolishness.

(The ?????) True words of sincere reproofs are often misunderstood.