When you finish this ______ , please go to the next

When you finish this activity , please go to the next.
When you finish this action , please go to the next.
我总觉得这两句话都能说得通，一个是这个活动，另一个是这个动作。请教高手！因为这道填空题只有一个是对的！

When you finish this ______ , please go to the next I __my homework ,mom? Really?When did you finish it? A finished B have finished C had finished How__can you finish the drawing you should finish the work________ 有are you finish?这个说法吗？ Can you help me ? Finish school When you know when you believe when you know when you bielieve 歌词