Please can you tell me if these are correct. Identify the noun clause. I put brackets around them.

1. (How the secret leaked out) was not immediately apparent.
2. (Where the stall has moved to) has not been ascertained.
3. The invited guests said (they would attend the party.)
Can you tell me (where the nearest train station is).
5. (what the magician showed us) was very amazing.
6. It appeares that (he has already visited this restauant).
7. The report that (his son has been kidnapped) is true.
8. The supervisor explained (how the mix up had happened).
9 it as obvious (something was seriously wrong with the car).
10. The reward will go to (whoever apprehends the criminal).

2. The word "to" shouldn't be in the sentence at all.

6. appears (sp) and the word "that" should be included in the noun clause.

7. include "that"

Everything else is perfect!!