根据课文内容填空。

     The students are (1)         the playground. They (2)          (3)          a PF lesson. (4)          is their

teacher. He is (5)         orders and the students are trying (6)          (7)          the orders.

1. (8)          (9)____ a line. Let's (10)____ some exercise.

2. (11)     __ your (12)          together. Jump (13)          and (14)          ten (15)         .

3. Put your hands (16)          your head and turn (17)          and (18)          ten times.

4. Lie (19)_        your (20)          and lift (21)          your left leg and (22)          it (23)_        your right 

    hand.