Актинии живут в симбиозе с раками-отшельниками. В чем обоюдная выгода этих отношений?

Were waiting
Came
Was cycling
Heart
Was passing
Didn't look
Fell
Was watching
Was knocking
Broke
Was playing
Rang
Was sitting

Were waiting;came; was cycling;head;was passing; didn't looked; fell;was watching;were painting;knocked;broke;played;was ringing;sat
но я не уверена что это правильно