初一英语题（根据首字母补全句子）
问题描述：
初一英语题（根据首字母补全句子）
I must be off now；o_______,i'll miss the early bus.
Zhai Zhigang ,the great Chiness a____,walked the first step in space.
When I was sleeping ,s____ the door opened and my dog came in.
答
otherwise
astronaut
suddenly