Ellen was a painter of birds and of nature,________,for some reason,had withdrawn from all human society.(2012·浙江,17)
He knows so much about the story. He must have read the book, _______?
He knew the problem was serious and promised to look into it _____ he reached office.
Greatly moved by what she did,_________.
—How wise of you to come round, but why? —________that all is right.
If better use is _____ your spare time, you’ll make greater progress in that.