83. I found the homework was not as heavy as what I used to get in my old school.

82. Going to the park for a picnic at the weekend sounds like a good idea.

81. I think the best way to protect the environment is to plant more trees.

76 broadcast/broadcasted　 　　77 regretted　

78 achievements　　 79. introduce　　 　80. preparing　　 　

66 challenging 　67 respect　　 68 Dynasty　 69 average

70 available　　　 71 donate　 　72. generation　

73 immediately　 74 develop 　75 experiences

31---35 ABBDA 36---40 BDDDA 41---45 BCBBA 46---50 ABBBC

DBDDA　　 BCBAB

BACAB　　 CABBB　　　 CCCCA　　　 CAACB