____ for his good skill,this doctor has a lo

____ for his good skill,this doctor has a lo
____ for his good skill,this doctor has a lot of visitors calling for help all the time.
A knowing B to know C known D to have known
-Can i help you sir?
-Yes,i bought this radio here yesterday,but it _____
A didn't work B won't work
C can't work D doesn't work
The guests were ___ in the front rows ___ to the president attentively.
A seating listened B seating listening
C seated listened D seated listening