1-4 look correct to me.
for #5, you are correct that to come is not a prepositional phrase because there is no object. If I were you, I'd leave it alone and keep the one next it. all others look correct.
Answer: Talk about them in a good light, appeal on his or her ego.
Explanation: That's how you can live with selfish people in peace till you can emancipate yourself.
True they cannot protect you from verbal harassment when you are working for that person
Colon is one of the punctuation which is used to:
<em>1. Lay emphasis
</em>
Example: He loved just one: Bruno, his dog
<em>2. To present dialogue</em> ( we write the name of the speaker and then insert colon followed by his/her dialogue.)
Example: Rita: How are you?
Mary: Fine, and you?
<em>3. Clarify composition titles</em> ( to explain parallel ideas colon is used in compositions like lectures or book titles), and
Example: Rousseau’s Dog: Two Great Thinkers at War in the Age of Enlightenment
<em>4. To introduce text or lists.
</em>
Example: Three types of Subordinate or Dependent Clauses are: Adjective clause, Adverb clause and Noun clause
Hence, two sentences which uses the colon correctly is :
C) Jessica's supplies for the trip included these items: a hairbrush, moisturizer, a toothbrush, and four bottles of mineral water.
D) Annette left her hometown with just one goal in mind: to see the world and experience different cultures.
Both the sentences introduces the list of items and things in the text. Hence, it uses the colon appropriately.
