Ⅰ 单句语法填空
1．With fallen (fall) leaves buried in the earth every year, the soil becomes richer and richer.
2．The puzzled (puzzle) look on his face suggested that he didn’t grasp what I said.
3．As we went out of the big crowd I got separated (separate) from my friends.
4．Please remain seated (seat); the winner of the prize will be announced soon.
