21. ______ shortest distance between two people is ____ smile.
A. A; the B.The; / C. A ; / D.The ; a
22. ----Mr. Hu, have you finished correcting the papers?
----Not yet, the papers _______ . You _______ get the results from me by tomorrow.
A. are corrected ; will B. are being correcting ; should
C. are being corrected ; shall D. are being corrected ; would
