You are playing 2/1 with udca.
1)
You lead the club ace, partner follows with the 7, declarer with the 10. Plan the play.
2)
Scoring: MP
p-(1S)-3C-(5D)
p-(6S)-all pass.
p-(1S)-3C-(5D)
p-(6S)-all pass.
You lead the spade king, partner plays the 4 and declarer the 5. Plan the play.
3)
Scoring: MP
1S-(p)-3C*-(Dbl)
??
*4+ spades, 5-8 HCP.
1S-(p)-3C*-(Dbl)
??
*4+ spades, 5-8 HCP.

Help

p-(1S)-3C-(5D)
p-(6S)-all pass.