When selecting contiguous files, you press and hold the ________ key while clicking the top and bottom files

Microsoft Office PowerPoint is used to create ________ that help convey information to an audience

Fill in the blank(s) with correct word

The Task Bag is intended to be used by cooperating clients, some of which add pairs (describing tasks) and others of which remove them (and carry out the tasks described). When a client is informed that no matching pair is available, it cannot continue with its work until a pair becomes available. Define an appropriate callback interface for use in this situation.

What will be an ideal response?