Every summer, many Americans happily attend baseball games in stadiums.
Adj. Noun Adj. Noun Adv. Verb Adj. Noun Prep Noun
The sentence in which the verb agrees with its subject is
B. Cobwebs cover the windows of the old house.
The others should read
Leaves blow in the strong wind.
Acorns fall from the oak trees in the woods.
Hope this helps.
this is kinda a tricky one, but I'd say timid