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。
The water in the river _________dirtier if nothing is done.
When I visited her last night, she __________by the fire and thinking.
My father _________to Beijing for his business last night.
I’m a singer is the most popular programme that I so far.
The geography teacher told us that Diaoyu Island ___________ in the east of China.
Don’t make the wetlands smaller. There is ________ (越来越少的空间) for wildlife.
________ (为了保护) students’ eyesight, Chinese government has taken action in recent years.
Millie is helpful and she ________ (与……和睦相处) her classmates.
A policeman is standing ________ (在……中间) the road directing the traffic.
—Who ________ (带领你们参观) the new lab tomorrow morning?
—Suzy will.