11. The back garden of our house contains a lawn， __     very pleasant to sit on in summer.

    A. which is    B. which it is    C. it is    D. where it is

    I2. There was a teapot fashioned like a duck， out of __    open mouth the tea was supposed to come.

    A. which    B. whose    C. its    D. that

    13. Betty spent all evening talking about her latest book， __     one of us had never heard.

    A. which    B. that    C. of what    D. of which

    14. Jane is a teacher， __    I am not.

    A. which    B. who    C. what    D. that

    15. She finished her work successfully， __     impressed us most.

    A. which    B. that    C. it    D. so that

    16. The corporation __     first will host the delegation for lunch.

    A. whose visit           B. the visit of which plant

    C. whose plant we visit   D. whose visit we plant

    17. The language __     he told these stories shocked us almost as much as the crimes that he described.

    A. in which    B. with which   C. by which    D. through which

    18. At the edge of the land lies the ocean， __    the earth is covered with water.

    A. where    B. which    C. that    D. when

    19. He is the only doctor __    ， isn't he？

    A. I can go         B. to who I can go    C. I can go to       D. for me to go

    20. Here came a young man __     I was certain was Mary' s brother.

    A. who     B. whom     C. of whom     D. of which

    ABABA CAACA