Fill in the blanks, multiple on one slide?

A Text Entry Box can be scored, so you can use validated TEB's for this purpose. Do not use the Fill-in-the-Blank quiz slide, because it will not allow partial scoring. I suppose you don't want to impose the sequence of the TEB's? In that case you need to be sure that the playhead remains in the active part of the TEB's. It may be necessary to rewind the playhead a couple of frames to achieve that, supposed that all TEB's have their pausing point at the same moment.