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--- What do you think of teaching, Bob?

--- I find it       and challenging. It is a job        you are doing something serious but interesting.

--- What do you think of teaching, Bob?

    --- I find it       and challenging. It is a job        you are doing something serious but interesting.

       A．funny, that       B．fun, that   C．fun, where       D．funny, which

--- What do you think of teaching, Bob?

--- I find it       and challenging. It is a job        you are doing something serious but interesting.

A．funny, that                     B．fun, that                  C．fun, where                     D．funny, which

--- What do you think of teaching, Bob?
--- I find it       and challenging. It is a job        you are doing something serious but interesting.

 --- What do you think of teaching, Bob?

    --- I find it       and challenging. It is a job        you are doing something serious but interesting.

       A．funny, that           B．fun, that              C．fun, where          D．funny, which