only one hand.
A. too strong
B. so strong
C. strong enough
D. such strong
( )5. I have all the paper. Can you lend me some?
A. looked for
B. turned down
C. used up
D. got up
( )6. I don’t think you may know the theory you do the experiment.
A. while
B. since
C. because
D. unless
( )7. The beautiful clothes drew her and she stopped to have a look.
A. copy
B. attention
C. double
D. method
( )8. The girl is singing under the tree is my sister.
A. when
B. which
C. who
D. whose
( )9. Scientists know DNA and they have done a lot of researches about it.
A. how to change
B. how changing