4、sterthreeyearsago.【答案】 tosponsor10.There's______traditioninourofficethatwhenit'ssomebody'sbirthday,theybringinacakeforusalltoshare.【答案】 aⅡ.用所给短语的适当形式填空betrueof,haveproblemswith,asaresult,makesure,fallasleep,telljokes1.Ididn't______untilitwasoneo'clock.【答案】 fall