What will the city of the future look like? No one knows for sure, and making【小题1】Predictions (predict) is a risky business. But one thing is certain-they are going to get bigger before they get smaller. In the future, care for the environment will bee very important 【小题2】as earth’s natural resources run out. We will use lots of【小题3】recycled (recycle) materials, such as plastic, steel, glass, wood and paper, and we will waste fewer natural【小题4】resources .We will also have to rely more【小题5】 on alternative energy, such as solar and wind power. All this seems certain, but there are plenty of things about city life in the future 【小题6】 which/that are not certain.
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解析：
【小题1】本句的含义为做预测是一件冒险的事，故本句空格处填预测的名词形式Predictions。
【小题2】本句的含义为由于地球的自然资源耗尽，所以保护环境将变得非常重要，故本句空格处填由于的单词as。
【小题3】本句的含义为我们将使用许多循环的材料，本题表示过去，故本句空格处填循环的过去式recycled。
【小题4】本句的含义为我们将浪费更少的自然资源，故本句空格处填资源名词的复数形式resources。
【小题5】本句的含义为我们将更多的依靠非传统的能源，rely on表示依靠的含义，故本句空格处填on。
【小题6】本句的含义为有许多有关未来城市不确定的事情，修饰名词事情是一个定语从句，先行词为物，故关系词可填which/that。