11. My father likes watching TV____________ he doesn’t like listening to music. 
    A. and       B.  so    C. but    D. because
12. We should use _____________pens and pencils to reduce rubbish. 
    A. reliable    B. reusable    C. refillable    D. sociable
13. In the future, we will have ___________to do housework. 
    A.  robots    B. wireless TV    C.  smart phone    D. hi-tech fridge
14. Eiffel Tower is the most attractive ____________in France. 
    A. building    B. resort    C. square    D. landmark
15. We should use _________to save natural resources. 
    A. oil    B. solar energy    C. coal    D. gas