Suddenly it hit me__________ difficult it was for my mother to get a master’s degree in China in the 1960s.

The purpose of our advertising is to _________ customers’ attention to our product.

The exam is coming and we have_______ homework to do every day.

She is very tired walking all day. Don’t _______ her waiting outside in the rain any longer.

I think science is more useful thanart.—- I disagree. I think art is _________science.