71. She was speaking English not only too slowly but very clearly as well -- Not only
72. Her grief was so great that she was almost fainted -- So
73. She seldoms buys a lottery -- Seldom
74. It was so heavy that we couldn’t carry it-- So
75. An enormous frog sat on the grass -- On
76. They can get there by no means -- By no means
77. She rarely saw him smiling -- Rarely
78. There is a very beautiful castle standing on the hill -- On
79. I’ve never in my life enjoyed such a delicious meal -- Never
80. He didn’t finish his work until the bell rang -- Not until
81. We only began to see the symptoms of the diseases after several months -- Only
82. I have never seen anyone in my life drinks as much as you-- never
83. A sleeping dog was lying under the table -- Under
84. His brother had rarely been more excited -- rarely
85. We not only lost all our money but we also came close to losing our lives
--Not only
86. He didn’t return to his home village until the war ended -- Not until

Question

71.	She was speaking English not only too slowly but very clearly as well --> Not only	
72.	Her grief was so great that she was almost fainted --> So 	
73.	She seldoms buys a lottery --> Seldom	
74.	It was so heavy that we couldn’t carry it--> So 	
75.	An enormous frog sat on the grass --> On	
76.	They can get there by no means --> By no means	
77.	She rarely saw him smiling --> Rarely	
78.	There is a very beautiful castle standing on the hill --> On	
79.	I’ve never in my life enjoyed such a delicious meal --> Never	
80.	He didn’t finish his work until the bell rang --> Not until	
81.	We only began to see the symptoms of the diseases after several months --> Only	
82.	I have never seen anyone in my life drinks as much as you--> never	
83.	A sleeping dog was lying under the table --> Under	
84.	His brother had rarely been more excited --> rarely	
85.	We not only lost all our money but we also came close to losing our lives 
-->Not only	 
86.	He didn’t return to his home village until the war ended --> Not until

Accepted Answer

71. Not only was she speaking English too slowly, but also very clearly.
72. She was so grieved that she almost fainted.
73. She seldom buys a lottery.
74. It was so heavy that we couldn't carry it. (No correction needed)
75. An enormous frog was sitting on the grass.
76. They can get there by no means. (Alternative: They can't get there by any means.)
77. She rarely saw him smile.
78. There is a very beautiful castle standing on the hill. (Alternative: On the hill, there is a very beautiful castle.)
79. I have never in my life enjoyed such a delicious meal. (No correction needed, but "I have never enjoyed such a delicious meal in my life" sounds more natural)
80. He didn't finish his work until the bell rang. (No correction needed)
81. We only began to see the symptoms of the disease after several months.
82. I have never seen anyone in my life drink as much as you.
83. A sleeping dog lay under the table.
84. His brother had rarely been more excited. (No correction needed)
85. Not only did we lose all our money, but we also came close to losing our lives.
86. He didn't return to his home village until the war ended. (No correction needed)

71. She was speaking English not only too slowly but very clearly as well --> Not only 72. Her grief was so great that she was almost fainted --> So 73. She seldoms buys a lottery --> Seldom 74. It...