(Writing) in a terse, lucid style, the book (describes) the (author's) childhood experiences in Louisiana (just before) the outbreak of the Civil War.

单项选择题Cathy (had) better (to change) her study habits if she (hopes to) be admitted (to a good university).

单项选择题I do not know where (could he have) (gone) (so early) (in the) morning.