I. to supply the necessary preposition: 1) discuss contract terms smb. a) to b) with c) at 2) to deliver the goods 6 months a) before b) in c) at 3) to be convenient somebody a) to b) at c) for 4) to accept payment collection a) before b) in c) for

I. To Supply the necessary preposition: 1) discuss contract terms smb. a) to b) with c) at 2) to deliver the goods 6 months a) before b) in c) at 3) to be convenient somebody a) to b) at c) for 4) to accept payment collection a) before b) in c) for

1) discuss contract terms with smb. 

2) to deliver the goods in 6 months. 

3) to be convenient  for somebody.

4) to accept payment  for collection.