I'll start: there is one question mark too many.
Please post your sentences in the Editing & Writing Topics forum in future.
Student or Learner
Out of the blue, he appeared at our doorstep. After many years of prolonged absence, we greeted him with boundless affection. Flabbergasted by the repetitive hugs and kisses that rained on him, he was speechless and spellbound. Oh! How we missed this "Goliath of Wits", for without which our lives would have been stale and lifeless!
The American writer Mark Twain said "Substitute 'damn' every time you're inclined to write 'very'; your editor will delete it and the writing will be just as it should be." The same can be said of adjectives. Use them sparingly.
Editor and writer. Not a teacher.
“Remove the comma, replace the comma, remove the comma, replace the comma...”
- R.D. Ronald
Most of those sentences make no sense. "After many years of prolonged absence" doesn't really modify anything, although that is its intention. Hugs and kisses do not rain on people. (Apparently, the visitor was surprised at the affection shown to him.) For the last sentence, try:
He appeared at our doorstep unexpectedly.
Oh, how we had missed him....
When out of the blue after many years of absence he appeared at our doorstep, we greeted him with boundless affection. Flabbergasted by the hugs and kisses rained upon him, he was speechless and spellbound. Oh! how we missed this "Goliath of Wits,"without whom our lives would have been stale and lifeless!
This looks right?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
One last time.