Problems from the Downey Sectional 1/03

1. None vul, IMPs, 10-board matches

    K10x AQ Q109 J1076x

   You	LHO	CHO	RHO
   1	2	Dbl	3
   Pass	Pass	Dbl	Pass
   ?

2. None vul, IMPs, 10-board matches

    AKJxx J Qxxx QJx

   You	CHO
   1	2
   2	3
   ?

3. Both vul, IMPs, 10-board matches

    10xxx K9xx Axxx 10

   Partner opens 1NT, 15-17. What's your plan?
   What would be your plan at matchpoints?