I didn’t have _____ to say, so I said _____. 

The box is big, but you can carry it because there is _____ in it.

After she won the dance competition, she found herself ________ of a celebrity in her community.

One of the most important problems they had to consider was________of public health.

(2014·石家庄高中复习教学质量检测)Seeing a large crowd at the street corner，I became aware of________unusual happening.