A．因为我想帮忙，所以我要抓紧写论文了。 B．我也很想帮忙，可是我还有学期论文要写。 C．我很想帮忙，只是我还要整理本学期的试卷。 D．虽然要整理本学期的试卷，我还是很想帮忙。
单项选择题Tommy said that he（）back within ten minutes.
A. will be B. would be C. be D was
单项选择题The computer,（）is a 20th century invention, has created startling technological changes in the way we organize and produce information.
A. that B. which C. what D. it
