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（友情提示：鼠标拖选单词即时翻译）
( ) 31. It’s ______ pleasure for me to be invited to play _____ piano at the concert.
A) the, a B) a, the C) a, a D) a, /
( ) 32. We used to stay at ______ for the weekend.
A) the Browns’ B) Browns C) Brown’s D) the Brown
( ) 33. _____ the help of his teachers and classmates, the boy has made _____ progress.
A) Under, a lot B) Under, great C) With, much D) With, many
( ) 34. Who teaches ______ chemistry?
A) they B) their C) them D) theirs