Q 5 Answer
2 Clubs
Your partner has done a Takeout double after SOUTH's 1D. They have a maximum of 2 hearts and a minimum of 3 of the other suits and ask you to call your best suit. NORTH has responded with 1H so you do not have to bid. However you have 9 HCPs (you should only bid if you have >8 HCPs) but you do not have a stopper in hearts so cannot bid 1NT. You should bid 2C.
Q1 5 Answer
PASS
Your partner has been forced to bid their best suit but may not have many points. As you do not have 16 points you should PASS.
Q 25 Answer
3 CLUBS
You need to tell your partner that you cannot support hearts and that you have 6 clubs. If you bid 2C that can be a limiting bid so to tell your partner that you have points bid 3C.