8. /first time/ he/ see/ fire/ probably/ when/ tree/ strike/ lightning.
A
The first time he saw fire was probably when a tree was struck by lightning.
B
The first time he saw fire probably when a tree was struck by lightning.
C
The first time he saw fire was probably when tree was struck by lightning.
D
The first time he saw fire was probably when a tree struck by lightning.
49. He/ soon/ learn/ make/ fire/ himself/ rub/ two/ stick/ together.
A
He soon learned how to make fire by himself by rubbing two sticks together.
B
He soon learned how to make fire for himself with rubbing two sticks together.
C
He soon learned how to make fire for himself by rubbing two sticks together.
D
He soon learned how to make fire by himself with rubbing two sticks together.
50. Fire/ very important/ man/ because/ he/ need/ fire/ keep/ warm/ night,/ cook/ food,/ and frighten/ enemies and wild animals/.
A
Fire was very important to man because he needed fire for keep warm at night, cook food and frighten away enemies and wild animals.
B
Fire was very important to man because he needed fire to keep himself warm at night, cook food and frighten away enemies and wild animals.
C
Fire was very important to man because he needed fire to keeping him warm at night, cooking food and frightening away enemies and wild animals.
D
Fire was very important to man because he needed fire by keeping his house warm at night, cooking food and frightening away enemies and wild animals.
51. Red Indians,/ example,/ use fire/ make/ smoke signals,/ people/ lit/ fires/ warn/ friends/ danger/ other countries.
A
Red Indians, for example, used fire to make smoke signals, so people lit fires to warn their friends of danger in other countries.
B
Red Indians, for example, used fire to make smoke signals, but people lit fires to warn their friends of danger in other countries.
C
Red Indians, for example, used fire to make smoke signals so that people lit fires to warn their friends of danger in other countries.
D
Red Indians, for example, used fire to make smoke signals, or people lit fires to warn their friends of danger in other countries.
52. Fire/ very also use/ give light,/ such/ burn sticks/ torches/ before/ invention/ oil lamp.
A
Fire was very also used to giving lights, such as burn sticks as torches before the invention of oil lamp.
B
Fire was very also used to give lights, such as burn sticks as torches before the invention of oil lamp.
C
Fire was very also used to giving lights, such as burning sticks as torches before the invention of oil lamp.
D
Fire was very also used to give lights, such as burning sticks as torches before the invention of oil lamp.
53. And before/ man/ discover/ gas and electricity,/ hang/ small fire/ wire basket/ post/ light/ streets.
A
And before a man discovered gas and electricity, he hung small fires in wire baskets at posts to light up the streets.
B
And before a man discovered gas and electricity, he hung small fires on wire baskets at posts to light up the streets.
C
And before a man discovered gas and electricity, he hung small fires in wire baskets from posts to light up the streets.
D
And before a man discovered gas and electricity, he hung small fires on wire baskets from posts to light up the streets.
