19.　　 Do not wear bright clothing or jewellery because sharks are a___________ to colors and shiny objects.

18.　　 However, there’re still two other sharks which are ___________ (凶猛的).

17.　　 Sharks do not f________ on humans if they have the choice.

16.　　 Liu Weihai was a____________ by a wild animal three months while leading a group of tourists in the mountains, and lost his left hand.

15.　　 In the distance I could see thunder and l______________ coming.

14.　　 The fact was that now I was f__________ by fear, not by cold.

13.　　 I felt so tired that I couldn’t help wondering whether or not I could get to my d________.

12.　　 One reason why we become s_____________ and have high blood pressure is that we misuse our senses in our everyday life.

11.　　 One explanation is that women’s sense of smell developed long ago, and is l________ to recognizing the smell of babies.

10.　　 During the experiment, volunteers were asked to sniff pleasant smells such as vanilla, and u_____________ smells such as durians.