Week 1: ad/ac- to or toward aqua- water astro/aster- star audi- to listen Week 2: auto- self bi- two biblio-book bio-life Week 3: cent(um)- 1/1000th or one hundred con/com/col/co/cor- with or together dent/don- tooth dis- down; away; not Week 4: e/ex- out or from graph/gram- write heli- the sun; radiate hydra/hydro- water Week 5: in/im- in or not ject/jectus/jac- throw, push, force kilo- 1/1000th or 1000 loc- place Week 6: log/logy/logue- speech; study; reasoning milli- 1/1000th or 1000 meter/metre- to measure mini- small; least Week 7: mitto/missi- to send mono- one micro- small op/ob- against Week 8: port- to carry post- after ped/pod- foot pro- forward; for Week 9: pre- before post/posit/pon/pound- put or place phon(e)- sound quad/quart- 1/4 or four Week 10: re- back; again sub/sup- under sist- to stand sonus- sound *Week 11: spec/spic/spect- to look - spectator, conspicuous scope- view -telescope, periscope scrib- to write -scribble, inscribe tele- from a distance -television trans- across - transfer, transport Week 12: tri- three -tripod, triangle, triplet terra- land -territory, terrain uni/uno/unus- one -unanimous, unicycle vac- empty -vacant, evacuate