Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．

It remains         whether Jack will be fit enough to play in the final.

__________ the stars are, the smaller they look, as is known to all the people.

（2007年普通高等学校招生全国统一考试山东卷，24）_____________ worries me the way he keeps changing his mind. 

It wasn’t _____the anti-Japanese war was over _______ his parents had died two years before