6. ____ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.
A.As
B.Whether
C.While
D.Now that
7. ____ of the burden of ice, the balloon climbed up and drifted to the South.
A.To be free
B.To free
C.Freeing
D.Freed
8. ____ should any money be given to a small child.
A.On no account
B.From all account
C.Of no account
D.By all account
9. ____the advances of the science, the discomforts of old age will no doubt always be with us.
A.As for
B.Despite
C.Except
D.Besides
10. ____ the claim about German economic might, it is somewhat surprising how relatively small the German economy actually is.
A.To give
B.Given
C.Giving
D.Having given