______Miss Wang can remember , she has not met the girl before .
---Why does Kate look so ____ ? ---Because her father was hit when he went to work .
--- ____homework is required for a middle school student every day ? ---About two hours .
--- Nancy, you are going to buy a flat here, aren’t you ? --- Yes, but I can’t ____ an expensive one .
--- When did you get to know the information? --- ____ I ____ yesterday.
--- What about yesterday’s homework, Amy?--- I found ____ hard to finish all the exercises.