11. Some people really enjoy swimming. _______________, others are afraid of water.
A. By contrast B. Although C. Despite D. Moreover
12. The ancient Aztec of Mexico had no technology for making tools from metal. _______________, they had sharp knives and spears made from a stone called obsidian.
A. Whereas B. Although C. However D. Despite
13. _______________ there was no electricity, I was able to read because I had a candle.
A. Unless B. Even though C. Because D. Only if
14. Even though a duck may live on water, it stays dry _______________ the oil on its feathers. The oil prevents the water from soaking through the feathers and reaching its skin.
A. due to B. besides C. in spite of D. in the event of
15. It is still a good idea to know how to type. _______________ the many technological advances in typewriters and word processors, a skilled operator remains indispensable.
A. Because of B. In spite of C. In case of D. In addition to
