instruction:
In this task, you are given a word, followed by a sentence. You should respond with a valid sentence which contains the word with the same meaning as in the given sentence. For example, if the given sentence refers to a 'fly' as the insect, you should not respond with a sentence which uses 'fly' as the verb. You may use the word in a different tense than is given. For example, you may use the word 'ended' in the output where the given input word is 'end'.
question:
lightning 
 Sentence: That tree was hit by lightning.
answer:
The lightning was hot enough to melt the sand.


question:
grade 
 Sentence: Grade A milk.
answer:
He got a good grade on the test.


question:
surface 
 Sentence: Earthquakes originate far below the surface.
answer:

Three quarters of the Earth's surface is covered by water.