Choose the right word to complete the sentence（选择合适的词，完成句子）
【小题1】After _________ school, Walt sold newspapers and delivered mails. （leave/leaving）
【小题2】My teacher talks in a loud _________ so that everyone can hear him clearly. （voice/sound）
【小题3】_________ people like the basketball for fun and exercise, but few people know how it started. （Millions of/Million of）
【小题4】We know about the _________ of dinosaurs from the skeletons, eggs and footprints they left behind. （life/lives）
【小题5】The math problem was so hard that Tom could _________ work it out. （hard/hardly）
【小题6】More and more blogs（博客）are created to talk about certain topics, _________sports, classical books and pop music. （such as/for example）