Помогите с заданием 7,срочно пожалуйста(

1. they were swimming in the river 2. the bell was ringing 3. Thomas was making a model of airplane 4. I hoped you were coming 5.we were singing a song 6. he boys were writting a letter 7.the cat was sleeping 8. I was openning the door 9.he was looking at the picture 10.the farmer  was working in the field