Form a suitable word from the word stem to fill the sentences solve crowd drive invention health 1. Have you found a .................. to that math problem? 2. Natural sources cannot provide enough, energy to support this .................... world. 3. Do they know that we have ..................... cars? They don't need a driver. 4. Of all the ................... in the world, which one do you like best? 5. Playing outside is ............... healthy than staying inside.

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