根据句意及汉语提示完成单词
【小题1】The _________（原因）is that computers can never replace books.
【小题2】—What is your new deskmate like？
—She is quiet and _________（诚实的）.
【小题3】Mary waited while John was _________（修理）the water pipes.
【小题4】After dinner with friends，Bob paid the _________（账单）.
【小题5】I think you should _________（道歉）to your brother for not being able to see him off.