Help me check my answer please.

Good day, teachers. I am answering a grammar book here and have answer them as follows:
1. A. Was John at the library when you got there?
B. No, he _______ home.
-has gone OR had gone? - my answer is the latter one.

2. A. Are you ready to go home?
B. As soon as ______
- The rain stops OR the rain will stop. - my answer is the first one.

3. A. Wow! You got here rather early.
B. I know. Traffic ______ almost non-existent.
- is OR was OR has been - my answer is 'was'

4. A. Do you think we can confide in Robert that we're quitting?
B. Yes. He _____ away any secrets.
- is never giving OR will never have given OR has never given OR had never been giving - my answer is 'is never giving'

5. A. I didn't pass the Math test.
B. I _______ it. You barely studied all week.
- was knowing OR have known OR had known OR knew - my answer is 'knew'

6. A. Do you think you can have the quarterly report done by 1 o'clock?
B. Hopefully, I _______ it by then.
- will finish OR have finished OR finished - my answer is 'have finished'

So sorry to bother you teachers. I have no one to check my answer for me. Any answer would be much appreciated.Answers with explanation would be better. Thank you