I. Give the correct form of the word given to complete the sentences.
1. The new model will run on solar energy, so it is .......................... (economy).
2. We call those types of energy (new) ........................ sources because we cannot run out of them.
3. Because our major sources of energy are running out while the solar energy is abundant and ............................. (limit)
4. La Tomatina will always be one of my most .................................................. memories ever! (amaze)
5. ..................................................., fossil fuels are harmful ti the environment. (fortunate)