用所给短语完成句子（共10小题；每小题1分，满分10分）
小题1:I came back _________________ the rain.
小题2:How many people are living in this house__________________?
小题3:You can not imagine what I am ___________________.
小题4:Then they began _________________ experiments.
小题5:Everybody was going about their business _________________.
小题6:He's been working without a rest _________________ breakfast.
小题7:He said he had left the door open __________________.
小题8:Under no conditions should we_________________.
小题9:Peace _______________ seemed an impossible dream.
小题10:We study hard _______________ make our dreams true.
HCO3溶液、稀盐酸