高一英语题、求解答、、重要的告诉我WHY

1.do you want to buy some radio__was shown on TV? Awhat Bwhich Cas Dthat 2.the friendly relationship between the two classes is developing as normally__it used to be Athan that B as that C than that D as what 3.Eric received training in computer for one year,__he found a job in a big company Aafter that B after which Cafter it Dafterthis 4.he never sells such books__are considered harmful t the reader A that B as C which Dwhat 5.MR little,__department Mr KING worked,called at the hospital on the same evening A whose B in which C in whose D who✀s