An answer to those questions has been found.
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These two things are completely different. Cross examination is when the attorney has the opportunity to ask questions of the other party's witness. A sentence (in the legal sense) is a punishment given to someone after they have been found guilty of a crime.
talk
(Insinuate : to introduce or imply gradually, or to subtly introduce oneself into an activity.) His questions about the accident seemed to insinuate that it had been my fault. She always found a way to insinuate herself into our plans.
all vegetables those were not in refrigerator have been rotted
Lingering questions are those which have been left unanswered (usually by someone who has been attempting to explain something). You could say that they are similar to 'lingering doubts'.
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She was so forlornly when she found out that she had been betrayed by her husband.
The lost civilization has been found!
I knew by his smugness that he had been found not guilty.
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It is awkward. Better would be "How has your experience been with our staff?" or "How has your experience with our staff been?". Those questions would be likely to get you simple responses - Good, Bad, OK, etc. If you want a more detailed answer - try something like "Could you describe your experience with our staff?".