1.       Somebody rang my doorbell just now, but I didn’t know ______.

A. who were they           B. who they were   C. who was it               D. who it was

2.       --- I hear we’ll have a new physics teacher this term.

--- Really? Do you know _______?

A. where he comes from                             B. what subject he teaches

C. if he is a chemistry teacher                      D. that he is a physics teacher

3.       --- Do you know _____ about China? --- The people and the food.

A. if Jim likes                 B. how does Jim like      C. what Jim likes   D. why does Jim like

4.       Excuse me, could you tell me _________?

A. where does he live      B. where he lives    C. he lives where           D. where did he live