I cheered up immediately and floated weightlessly around in our spaceship cabin watching the earth (to) become smaller and the moon larger.

主语-1）兴奋；2）漂浮；3）观察（宾补）

I got up and listened to music watching my mum (to) cook breakfast.

weight n.重量 lose weight 减肥
homeless a.无家可归的
weightlessly adv.在失重的情况下