a small problem with tense and tag question

[nessie]

1/ As soon as you ..., I ... to see you again
a. had gone - wanted
b. went - wanted
c. go - will want
d. have gone - have wanted
=> I think the answer for this should be a, though actually it is c, then am I right or wrong?
Besides, I wonder if we can use two participle tenses in one sentence (option d) to emphasize the meaning that "I" wanted to see "you" at that time and now "I" still want to see "you"

2/ It's Mr Smith, ...
=> should it be "isn't it?" or "isn't he?"

everybody is here, aren't they?
=> Is the above sentence right or wrong in standard English?

Many thanks for your time
Nessie

[Alan]

Hi,

I would accept a, b and c for (1).

(2) It's Mr Smith, isn't it?

(3) Everybody's here, aren't they?

Alan
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