没有必要担心英语

There is no need to afraid the imposssible things

you don't need to worry about the thing which is impossible.

You don't need to worry about him绝对正确，若有其他需要翻译请追问

You don't need to worry about him。根据填空，这句话还可以这么说：There's no need for you to worry about him.有帮助请采纳,不明白可以追问。

Don't worry about anything impossible.应该是吧。。