He had only experienced tangible and corporeal events in his life, but the hippy girl opened up his what side? - insubstantial - mind - intangible - ethereal - spiritual  The best answer is
spiritual

When you hair grows too long and heavy you can cut it to make it more what? - very thin - more manageable - smooth - lightweight - long or short  The best answer is
lightweight

The engineer put the new invention on the table in front of his bosses, he turned on his microphone and began his what of the product? - stage - demonstration - record sound - parade - conference  The best answer is
demonstration