Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)

前冲刺测试卷）11. How I wish __ more when I was at university, which is too late now.

The singer is always very________to the reaction of the audience when she gives a performance.[ ]

er if you’d mind me asking you somepersonal questions.–no, not at all. ____________.

One of the wonders of the _____ world isthe pyramids in Egypt.