4. Describe a piece o equipment which you found hard to use for the first time 描述一件你第一次很难使用的设备

5. Describe a product you bought that made you happy 描述一件你购买的令你开心的产品

类似的话题还有：

Describe a mobile App that you think is the most useful 描述一个你认为最有用的移动应用