选择题：There are many problems in our modern world. One v

There are many problems in our modern world. One very（ ）serious problem is energy. We get a great （ ） of energy we need from coal, gas, and oil. However, the （ ） of energy which we use is （ ） every year, and we only have enough coal, gas, and oil for the next twenty or thirty years. How will we live （ ） the energy which these things give us? Scientists are looking for （ ） to this problem. They are looking for new （ ） to produce energy. For example, they are working with new ways to （ ） energy from the light and heat of the sun. They are also working with plans which produce energy from （ ） of the oceans. All of the new methods （ ） scientists are finding are still very expensive, but perhaps they will help solve our energy problems （ ） the future.
(1)
 A. number
 B. group
 C. price
 D. deal
(2)
 A. effect
 B. amount
 C. course
 D. program
(3)
 A. increase
 B. increasing
 C. had increased
 D. is increasing
(4)
 A. without
 B. improve
 C. producing
 D. strength
(5)
 A. key
 B. a direction
 C. a solution
 D.&