80．You have to clean r____ ground to improve soil conditions．

79．The country has its own government and laws, so it is a s____ country． 79．____

78．____

78．Since he b____ to that union, he does a lot for it．

77．The computer can r____ the owner's voice and recorded his instruction． 77．____

76．____

76．The man ordered a TV set in the d____ store．