1. We had to send in...an electrician to mend the switch. 2. I have been thinking..of. joining the library but i haven't had time yet. 3. I looked .for..my dog everywhere but couldn't find him/her. 4. He's very selfish. He only thinks .about..himself. 5. Can you explain to...me what you mean? 6. The man sitting opposite me kept looking at...me. 7. It didn't occur to...me to ask him for...the proof of his identity. 8. The police are looking .for..the boy who disappeared from home last week. 9. I'm thinking about...the children. How can we help them? 10. He boasts of...being the best athlete in the team. 11. His books have been translated into...many languages. 12. We waited .for..Jim for half an hour but he didn't come. 13. They didn't have much money, so they were looking .for..cheap accommodation. 14. I don't think much of...this show. 15. What are you laughing .at? ..I can't understand what's funny. 16. My uncle suffers .of..multiple sclerosis and is dependent .on..my aunt to look .after..him. 17. When i looked .at..my watch, i coudn't believe that it was so late. 18. In today's world people seem to be very anxious and suffer from...stress. 19. It isn't my car. It belongs to ...Mike. 20. I apologize .for..breaking your drill. 21. We can't rely on ...our car. It keeps breaking down. 22. I've been waiting for...an opportunity like this all my life. 23. He complained to...the manager about...the poor service at the restaurant.