15.---The current international financial crisis is affecting most countries in the world.

　 ---Would it be at least several years ____ everything returns to normal?

A.when　　　　　　　 B.that　　　　　　　 C.since　　　　　　　 D.before

14.____ , the boys were shouting and singing.

A.Happy and excited　 B.Happily and excited　 C.Happily and excitedly D.Happy and excitedly

13.They appeared ____me, so I had to explain to them.

A.misunderstanding　 B.misunderstood　　　 C.to be misunderstood　 D.to have misunderstood

12.Fans from miles around crowded into the stadium for the concert of Jay Chou on September 4^th, 2010,____ are popular with teenagers.

A.many of his songs　 B.many of whose songs C.many of which songs　 D.and many of whose songs