Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
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,________.
If better use is _____ your spare time, you’ll make greater progress in that.
Not everyone likes everyone else, _____?