rupt [break]

interrupt (break into)

rupture (break)

sci [know]

conscious (knowing or being aware of things)

omniscient (knowing everything)

scope [see, watch]

kaleidoscope (instrument for viewing beautiful forms)

microscope (instrument for seeing tiny objects)

scrib, script [write]

manuscript (written by hand)

scribble (write quickly)

sen [old]

senile (the weakness of old age)

senior (an older person)

sequ, secu [follow]

consecutive (following in order, one after another)

sequence (one thing following another)

spec [look]

inspect (look at carefully)

specimen (an example to look at)