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―Is the experiment easy?
― ________ . I’ll just do my bit.
  A. I think so           B. Certainly
  C. Not a little           D. Anything but

—Is the experiment easy?      —____. I’ll just do my bit.

A. I think so          B. Certainly           C. Not a little         D. Anything but

—Is the experiment easy?— ________ . I'll just do my bit.

A. I think so       B. Certainly             C. Not a little　     D. Anything but

—Is the experiment easy?

　　　　— ________ . I’ll just do my bit.

　　A. I think so　　　　　　　　　　　B. Certainly

　　C. Not a little　　　　　　　　　　 D. Anything but

—Is the experiment easy?

　　　　— ________ . I’ll just do my bit.

　　A. I think so　　　B. Certainly   C. Not a little　　D. Anything but