12.So absorbed__________in her work that she didn't realize I was behind her.
________this problem, they don’t know how to deal with it.
You will see what great benefit the computers you own can be _____ every time we use them.
Is it the fact ____ he hasn’t turned in his research report?
The businessman is very modest about his success. He says it’s _____ the result of good luck as of his own diligence.
—Peter, come on. I need your hand!—_____