A:4+4 2
B:4+4 3
C:6+2 3
D:8
① ____ A. he B. her C. they D. it
② ____ A. write B. slept C. wash D. fly
③ ____ A. breakfast B. meal C. dinner D. lunch
-- Have you finished your work ?
-- Yes, I have. I've finished it.
下列实验正确的是( )