将以下单词填入空格: snowed under / copy/ favor / Lisa gets a call from her supervisor, John Smith. John would like to ask Lisa to 1__________ some pages for him, because he is 2__________ with work. However, Lisa doesn’t know how to use the copier, so she asks Fiona to do her a 3 __________ . With the help of Fiona, Lisa gets the copies. After finishing that, she would get down to setting up the meeting for next Monday.