1 . Generally speaking, students have a ten-minute i________ between two periods, when students can relax themselves. （根据首字母单词拼写）

2 . Several red and white barriers marked the road at regular ________ (间隔) of about a mile. （根据汉语提示单词拼写）

3 . Between the two parts of the concert is an i________, when the audience can buy ice-cream. (根据首字母单词拼写)