题目内容：

请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。

1.The water in the river _________dirtier if nothing is done.

2.When I visited her last night, she __________by the fire and thinking.

3.My father _________to Beijing for his business last night.

4.I’m a singer is the most popular programme that I           so far.

5.The geography teacher told us that Diaoyu Island ___________ in the east of China.