I.Fill in the blanks with the given words in their proper forms.（用所给词的适当形式填空）（5%）
1.Helen has been expecting the _______ of her net-pal since last Thursday.(arrive)
2.My trousers are a bit too long.Would you mind _______ it by two inches for me?(short)
3.Now China has become much ________ with the development of modern science and technology.(power)
4.During rush hours underground trains are always ______ because they are quicker and more convenient.(fill)
5.The Tangshan Earthquake was the deadliest earthquake in the ______ century in Chinese history.(twenty)