阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词．
Bill and Simon were good friends．One summer they were on （71）h ．They wanted to sail around the Caribbean Sea in their boat for two weeks．
During their trip，they saw many whales．Bill and Simon were very （72）e because they had wanted to see them very much．Unluckily，（73）w they were watching them，the whales began to hit the side of the boat．
Suddenly，（74）w started coming in，and they realized that they were in trouble．They （75）q_ jumped into the lifeboat before the sank（沉没），and watched it disappear under the sea．
Luckily，they had enough food and water for about twenty （76）d ．They also had a fishing line and a machine which could change sea water （77）i
drinking water．These two things helped them to survive（存活） during their terrible experience．
For the next fifty days they caught about ten fish a day and （78）a them．They saw about twenty ships，but although they waved and shouted when the ships were passing，（79）n saw them．They were becoming weaker and weaker．Then，just as they were beginning to （80）l hope，a fishing boat saved them．