基础导练
Ⅰ. Fill in the blanks with the given words, using their proper form.
1. At this time yesterday, I _____(read) ne wspapers while Susan _____ (play) the piano.
2. Tom _____(dance) with his friends when I saw him.
3.—What _____ you _____ (do) at ten o’clock yesterday?
—I _____(study) in class.
4. I _____(sleep) at that time.
