My teacher probably spoke about this rule ,but Iforgot about it or didn’t ______________.

239. He_____ me 50 yuan and didn’t returnit to me until last night.

In the past few years, My Heart Will Go On was a popular song among young people, ____ were often heard singing it at parties

Why didn’t you buy any bread –Sorry, I _____.

Sometimes we should roles so that we can understand each other’s difficulties, thus promoting our cooperation.