小题1:The government has taken action. Now there is _______pollution in the river.
小题2:Sandy is planning to hold a party to celebrate her father’s _________birthday.
小题3:I was happy that I finished my job __________.
小题4:Millie’s grandparents live in a flat not far from _________, she can often see them.
小题5:Peter and Judy keep in touch by ___________ emails.
小题1:less
小题2:forty-fourth
小题3:successfully
小题4:hers
小题5:writing
题目分析：
小题1:句意：政府已经采取了措施。现在河里的污染少了。根据The government has taken action.可知政府采取措施，污染应是比过去少了，此处修饰名词pollution，故用形容词little的比较级less。
小题2:句意：Sandy正计划举行一个聚会来庆祝她父亲地44岁生日。此处修饰名词birthday，应是序数词forty-fourth。
小题3:句意：我很高兴我成功地完成了我的工作。因修饰动词短语finished my job，故用副词successfully。
小题4:句意：Millie的祖父母住在一个离她不太远的公寓里，她可以经常看到他们。结合句意，此处指她的公寓，故用名词性物主代词hers。
小题5:句意：彼得和朱迪通过些电子邮件来保持联系。by doing sth.通过做某事，故此处为writing。