围绕本课标题 A slip of the tongue 口误（免费演出与口误）主题，AI 老师会出 若干个简单问题，
每个问题听完后，用 完整句子口头作答。
⚠️ 尽量说完整句子，不要只说一个词；优先用本课句型与词语：do anything to see a free show / When the news got round that / a comedy show would be presented / at our local cinema / we all rushed to see it / had to queue for hours / there must have been several hundred people present / one of the dullest we have ever seen / Those who failed to get in / need not have felt disappointed / many of the artistes / who should have appeared did not come / came from the advertiser / at the beginning of the programme / very nervous / stood awkwardly before the microphone / As soon as he opened his mouth / everyone burst out laughing / what the poor man should have said / what he actually said was / a slip of the tongue