6.The new type of car is fairly economical of fuel.

A.using little

B.effective

C.efficient

D.economic

7.What were the effects of the decision she made?

A.result

B.extinction

C.lure

D.reason

8.Put some effort into your work

A.effect

B.force

C.coverage

D.energy

9.The number of United States citizens who are eligible to vote continues to increase.

A.encouraged

B.enforced

C.entitled

D.expected

10.According to the constitution, anyone over the age of 18 is eligible to vote.

A.illegal

B.legitimate

C.required

D.qualified