That kind of plant can be made ______ paper and paper can be made ______ wood

Alice, you look puzzled．Haven’t you understood it? —Yes．I _of another problem just now

When I came in her room, Mary was ________ in her book.[ ]

George always does his best, and that’s ______ I like about him.

ince the disaster of September 11,American economy has got into a jam. The underlined part probably means _____.