its
前一句的主语是pair,所以是单数形式,后面用单数的its代替.Lucyasked me to buy some fruit and she was ______________________(负责组织这个聚会)———————————————（所有的那些药片都不需要了） to such a healthy body. _________(我确定）that Lily has gone to Beijing.Lucyasked me to buy some fruit and she was (in charge of organizing the party ). (负责组织这个聚会)( All the pills are not in need )（所有的那些药片都不需要了） to such a healthy body.( I'm sure ) (我确定）that Lily has gone to Beijing.