根据句意及汉语提示完成单词。

1. This suit is out of style, _______ (然而) , I like it very much and often wear it.

2. We're doing something to make our city clean, so there will be less _______ (污染) in the future.

3. My grandfather lives _______ (孤独地), because my parents are so busy that they don't often go

    home to see him.

4. It is _______ (不可能的) to learn English well in a day.

5. I don't think l will _______ (失败) in the math test. I can pass it.

At a basic level,cloud computing is simply a means of delivering ITresources as ____(71)___.Almost all IT resources can be belivered as a cloud service:applications,compute power,storage capacity,networking,programming tools,even communication services and collaboration ____(72)____. Cloud computing began as large-scale Internet service providers such as Google,Amazon,and others built out their infrastructure.Anarchitecture emerged:massively scaled,____(73)____ distributed system resources,abstracted as virtual IT services and managed as continuously configured,pooled resources.In this architecture,the data is mostly resident on ___(74)___ "somewhere on the Internet" and the application runs on both the "cloud servers" and the user’s browser. Both clouds and grids are built to scale horizontally very efficiently.Both are built to withstand failures of ___(75)___ elements or nodes.Both are charged on a per-use basis.But while grids typically process batch jobs,with a defined start and end point,cloud services can be continuous.What’s more,clouds expand the types of resources available - file storage,databases,and Web services - and extend the applicability to Web and enterprise applications.

（71）处填（）。

A．hardware

B．computers

C．services

D．software