1) The blockade was a success.

　　封锁很成功。

　　2) As he is a perfect stranger in the city, I hope you will give him the necessary help.

　　他对这城市完全陌生，所以我希望你能给他必要的帮助。

　　3) Independent thinking is an absolute necessity in study.

　　独立思考对学习是绝对必需的。