Air pollution is getting more and more serious，so we must take action________it is too late.

After two years’ research, we now have a ____ better understanding of the disease.

The man as well as his horse _________ crossed the river ________ from Tokyo.

（2014年安徽省合肥市高三第三次教学质量检测）29. Whenever we went to my uncle’s house, we ______ play in the garden.

ight, there were millions of people _______ the opening ceremony live on TV.