Complete the sentences with the words from the box. There are two extra words.

Here are the completed sentences with words from the box: 1. Be careful. That dog isn't **friendly**. 2. I can't do my homework. It's **difficult**. 3. He is a **fast** runner. 4. I can't buy this watch because it's very **expensive**. 5. My bike isn't dangerous. It's **safe**. **Explanation:** * **Sentence 1:** The word "friendly" best fits the context, as it describes a dog's potential behavior. * **Sentence 2:** "Difficult" makes sense as something that prevents someone from doing their homework. * **Sentence 3:** "Fast" appropriately describes a runner's speed. * **Sentence 4:** "Expensive" clarifies why someone can't buy a watch. * **Sentence 5:** "Safe" describes something that isn't dangerous, and it's the opposite of dangerous.