Fill the blanks with suitable words; (where, which, after, why, that, while, what, who, if, as, since). I. You have not changed … I saw you last. 2… he has finished his work, he may go home. 3. The house … we live in is new. 4. I don't know … I will go in summer. 5. We know … the sun is our most important source of energy. 6. … he has finished his work, he may go home. 7. The house … we li