用所给词的正确形式填空

1.His grandpa _________ (die) ten years ago.

2.Look! Some students __________ (sing) to the music.

3.She will come back if she _________ (be) free.

4.They were pleased to see the _________ (move) film.

5.To my _________ (surprise), I can meet you here.

6.The _________ (two) lesson is the most difficult one.

7.Jim did the work _________ (well) of all the students.

8.Spaceships _________ (with) people have reached other parts of the universe.

9.Amy practices __________ (speak) Chinese for an hour every day.

10.Look! How __________ (beautiful) these pictures are!

什么是统计分布？