86. The Louvre Museum has more than 6,000 other European paintings, ______ (从……到……) from the 13^th century to the 19^th century.

85. There is a t______ in the plot when a very generous stranger gives Pip a lot of money.

84. He made a lot of scientific discoveries that he shared with the world, p ______ in the field of astronomy.

83. Please tell me how to d______ a poisonous snake from a harmless snake.

82. The government issued a statement c______ the bombing which killed hundreds of innocent citizens.

81. There are many wild animals in the forests and on the freezing, ice-covered lands in the north, and fish are a______ in the seas and rivers.