Answer:
21. He always reverts back to his childlike manner when he's around his mother.
22. The man staggered under the weight of the large desk he was carrying.
23. George's only <em>fault</em> is that he's too friendly.
24. Not much happened on this trip. It was rather uneventful.
25. Young children often ask many questions because they are naturally <em>iniquisitive</em>.
26. The mother <em>gazed</em> lovingly at her new baby.
27. No matter what she tried, nothing would <em>dispel</em> Jane's fear of flying.
28. Sandy's father helped her remove a small <em>splinter</em> of wood from her finger.
29. We knew he was sad because a tear slowly <em>trickled</em> down his cheek.
30. She had an adverse reaction to the medicine and broke out in a rash.
Explanation:
21. Revert means go back to, so in this sentence, he is going back to the way he used to act as a child.
22. To stagger is to walk unevenly.
23. Fault can be used as a way to say, "the only thing wrong."
24. Uneventful means nothing happened.
25. <em>Inquisitive </em>is a synonym for curious.
26. <em>Gazed:</em> to fix the eyes in a steady intent look often with eagerness or studious attention.
27. To dispel something is to drive away/get rid of it.
28. A splinter is a tiny piece of wood.
29. A tear is water and moves as such. And because it was slow it trickled instead of gushed like it would have if he was crying a lot.
30. <em>Adverse</em>: Unfavorable or not good.