．The European Central Bank yesterday _______ the document was genuine but refused to make any further comment.
| A．expected | B．suggested | C．concluded | D．confirmed |
Many countries are increasing their use of natural gas , wind and other forms of ______.
| A．power | B．force | C．energy | D．strength |
The fact that many college graduates get lower pay than some workers has ______ a heated discussion.
| A．set out | B．set about | C．set up | D．set off |
I have no idea ______ it is that makes him puzzled.
| A．how | B．what | C． why | D．which |
He sat at the desk, __________ a novel.
| A．read | B．to read | C．reading | D．reads |
______ tourism developing, more and more people prefer to go travelling for a holiday.
| A．As. | B．With | C．Upon | D．For |