The road to(succeed) is to work honestly.
句子意思为：通向成功的路就是踏实地工作。故填succeed的名词形式success。
Liu Cixin is the（作家）who wrote the science fiction novelThe Three-Body Problem.
名词词义。
刘慈欣就是写《三体》的那位作家，writer表示“作家”。
You need not only talent but also hard work to become a _____ football player.
形容词词义辨析。
根据题干可知“需要天分和努力成为成功的足球运动员”，使用形容词successful表示“成功的”，故选B。