练习材料：
Lesson19 Sold out
'The play may begin at any moment,' I said.
'It may have begun already,' Susan answered.
'I hurried to the ticket-office. 'May I have two tickets please ?' I asked.
'I'm sorry, we've sold out,' the girl said.
'What a pity!' Susan exclaimed.
Just then, a man hurried to the ticket-office.
'Can I return these two tickets?' he asked.
'Certainly,' the girl said.
'Could I have those two tickets please ?' I asked.
'Certainly, 'the girl said, 'but they are for next Wednesday's performance.
'I might as well have them,' I said sadly.
［ˈlɛsən］19 ［soʊld］［aʊt］ ［ðə］［pleɪ］［meɪ］［bɪˈgɪn］［ət］［ˈɛni］［ˈmoʊmənt］,' ［aɪ］［sɛd］. ［ɪt］［meɪ］［həv］［bɪˈgʌn］［ɔlˈrɛdi］,' ［ˈsuzən］［ˈænsərd］. ［aɪ］［ˈhɜrid］［tə］［ðə］［ˈtɪkət］-［ˈɔfəs］. ［meɪ］［aɪ］［həv］［tu］［ˈtɪkəts］［pliz］ ?' ［aɪ］［æskt］. ［aɪm］［ˈsɑri］, ［wiv］［soʊld］［aʊt］,' ［ðə］［gɜrl］［sɛd］. ［wʌt］［ə］［ˈpɪti］!' ［ˈsuzən］［ɪkˈskleɪmd］. ［ʤəst］［ðɛn］, ［ə］［mæn］［ˈhɜrid］［tə］［ðə］［ˈtɪkət］-［ˈɔfəs］. ［kən］［aɪ］［rɪˈtɜrn］［ðiz］［tu］［ˈtɪkəts］?' ［hi］［æskt］. ［ˈsɜrtənli］,' ［ðə］［gɜrl］［sɛd］. ［kəd］［aɪ］［həv］［ðoʊz］［tu］［ˈtɪkəts］［pliz］ ?' ［aɪ］［æskt］. ［ˈsɜrtənli］, ［ðə］［gɜrl］［sɛd］, ［bət］［ðeɪ］［ər］［fər］［nɛkst］［ˈwɛnzdiz］［pərˈfɔrməns］. ［aɪ］［maɪt］［əz］［wɛl］［həv］［ðɛm］,' ［aɪ］［sɛd］［ˈsædli］.
任务配置：L0＋L4