完型填空的题目……~The world is filled with many interesting sounds .

完型填空的题目……~
The world is filled with many interesting sounds . Some are unpleasant to ____41___while others are very pleasant to hear . In a single day you ___42___hear hundreds of different sounds. All sounds are different. Some may be soft;others may be___43___.Some sounds are high;others are low.
Some sounds are___44___.Without sound we cannot talk___45___listen to one another. The ringing of the alarm clock___46___people up.The hooting of a car___47___people of danger.
Some sounds are harmful.When planes fly low over the___48___,they very loud sound can___49___damages to house.Very loud sounds can even make people___50___.
( )41. A.people B.human C.our ears D.our feelings
( )42. A.only B.probably C.hardly D.frequently
( )43. A.loud B.hard C.deep D.strong
( )44. A.useful B.useless C.good D.bad
( )45. A.to B.and C.but D.or
( )46. A.wakes B.awakens C.frightens D.lets
( )47. A.tells B.mentions C.warns D.informs
( )48. A.land B.earth C.fields D.soil
( )49. A.make B.cause C.lead D.get
( )50. A.injured B.wounded C.weak D.deaf