When I passed there,I saw some farmers ____(work) in the fie

When I passed there,I saw some farmers ____(work) in the fie When I passed the playground,I saw some students _____ footb I saw a little boy trying when i passed the park,some time l When I passed the school,I saw the students in the school cu When I passed the bus station,I saw him _____ in line The farmers ______(pick) apples when I saw them. I saw a little boy trying when i passed the park passed能改成pa When i got there,I saw some boys __on the playground.这里为什么填p when i got there,i saw some boys ____on the playground .空内应填 i saw a boy crying when i passed the park（后面一个i能去掉吗? When I looked----,I saw some birds flying in the sky I saw my mother washing bowls in the kitchen when I ____ hom