______ he talked with her for a long time, he failed to convince(说服)her.
—— Li Lei can speak French very well. —— ________.
--Would you mind my _______the window? --You'd better not.
The flowers over there _________ by the students last year.
——Must I stay at home and take care of him? ——No, you ___________. He can take good care of himself.
The desk is ________ heavy ________ carry.