Answer:
They are used as synonyms to convey the idea that the puppy enjoys being playful.
The correct option is this: WRITING IS DIFFICULT BECAUSE SO MANY SKILLS ARE INVOLVED.
A topic sentence refers to the sentence which expresses the main idea of the paragraph in which it occurs. The topic sentence is usually the opening sentence in the paragraph; the other sentences in the paragraph just serve to support the topic sentence.
They are both dealing with kicking something
I stole a cookie when you weren’t looking
