21.She prefers a(n)________trip that she took with two friends to Jiuzhaigou.

   A. independent B. global C. equal  D. deserted

22. How much does that new business________a month?

       A.bring out     B.bring on      C.bring in       D.bring up

23. ________smoking does great harm to health.

       A.Majority of doctors believe       B.Majority of doctors believes

       C.The majority of doctors believes       D.The majority of doctors believe