完成句子 根据提供的意思，完成句子。（共10分，每格0.5分）

1.他病得如此严重以致他是否回来还不清楚.

He is so seriously ill that ___ was not clear ____   ____   ____ he will come.

2.太空飞船使我们到月球旅游成为可能.

Spaceship ______  ________  ________  for us to travel to the moon.

3.由于核辐射,很多日本人担心安全问题.

______   _______    ______    _______ nuclear radiation, many Japanese are worried about safety.

4.我正要说出真相这时他打断我.

I ______   ______    ______ tell the truth  _____  he interrupted me

5.老师不允许学生考试作弊逃脱惩罚.

The teacher won’t _____ students ______   ______   ______   _______ in the exam.