![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
Fill in the gap with words or phrases given. Change the form where necessary. (promote, summarize, make up for, investigate, performance, not...in the least, initial, on occasion, emerge, critical, phenomenon, insert, attach, in retrospect, await, in due course) Make sure the label (标签) is firmly ________ to the parcel (包裹) before you mail it.