根据要求，改写下列句子。

1. I arrived in Beijing before dark yesterday. (改为一般疑问句)

2. Our plane leaves at ten o'clock tonight. (改为否定句)

3. Leo and David are the same age. (保持句意基本不变) 

4. He put on his warm clothes because of the cold weather. (对划线部分提问) 

5. He will work hard. He will be able to catch up with the others. (用if合并句子) 

Windows98提供了一系列可用于直接访问和使用多媒体设备的API组件。其中，支持图形、图像、音频和视频信息的处理，且用户可以从微软的有关网站下载其最新版本的多媒体组件【 】。