Answer:
2. Why ………are……… you (laugh) ……laughing…………? What’s so funny?
3. I can’t help you now. I (work) ……am…working……………
4. Oh no! It (rain) ………is raining…………… again.
5. ……Are….. you (watch) …………watching………… the TV or can I turn it off?
6. Bill (learn) ………is learning………… to drive at the moment. His father (teach) ……is teaching……… him.
7. Listen! The neighbors (have) ……are having……………… an argument again.
8. Sally (wear) ……………is wearing……… her new T-shirt today.
9. Robert! What ……are…… you (do) …………doing………… here?
10. I (not sleep) ……………am not sleeping……… very well at the moment.
Explanation:
Iron
bible
lamb
tooth
concrete nouns are nouns that are objects something you could actually hold or see
Hey there!

- It refers to your "Desire" of the erudition for the corresponding of some object which we scrutinize of the particular conduct which is conjointly "accepted" by the scientists for the condition to avoid some repercussion on your subjective circumstances
Good luck on your assignment and enjoy your day!
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I think the central idea is The people