Đúng or sai.Sai thì sửa.Thế thôi ace 1/ when the mailman / was sleeping / The Le family / came /. The Le family was sleeping when the mailman came. 2/ our accommodation is / at a hotel because / the ticket price / We’ll stay / included in /.  We'll stay at a hotel because our accomodation is included in the ticket price 3/ the crowd / won the race, / was cheering/ When Nam / . When Nam won the race, the crowd was cheering. 4/ the school drum was / arrived at school, / sounding / When Lan /. ---> When Lan arrived at school, the school drum was sounding. 5/ he plane got / raining when / to Ha Noi / It was /. It was raining when the plane got to Ha Noi. 6/ he phone / was eating, / rang / While Hoa/.  While Hoa was eating, the phone rang. 7/World Heritage Site / by UNESCO / was recognized / as a / Ha Long Bay / . /  Ha Long Bay was recognized as a World Heritage Site by UNESCO. 8/ while he / fell asleep / a newspaper / Peter / was reading / . /. Peter fell asleep while he was reading a newspaper. 9/at busy times / It is difficult / in Da Lat / to find accommodation /. / It is difficult to find accommodation at busy times in Da Lat. 10/ to visit Australia / people are friendly / I’d like / because Australian / . / I’d like to visit Australia because Australian people are friendly.