It is useful to be able to predict the extent _____ a price change will affect supply and demand.
When _____ her father would come soon, she had an _____ look on her face.
---I beg your pardon? ---Your mind must be ________ when I was speaking, wasn’t it?
Her little son fell off the boat into the water due to her carelessness. The mother couldn’t help _____because she couldn’t help _____ her son out of the danger.
What troubled the teacher was that no one present made an answer when asked who had broken the glasses, so he didn’t know who _____________.
The traffic was _________when the car accident happened .