单选题 It's necessary __ enough water every day.

单选题 The cat __ on the chair.

单选题 I __ very happy yesterday.

单选题 Yang Ling__ ten years old.

单选题 She__ a college student.

单选题 There __ some books on the desk.

单选题 I __ a teacher.

单选题 This __ a new car which is made in China.

单选题 He __ working in a big city.