13. Marie Curie was the scientist that first d       Radium (镭）.

12. At first I r      the same word over and over again to pronounce it well.

11. We all know that k      comes from practice.

(   ) 10. Lucy is a(n)      student. She answers the teachers' questions      in her class.

A.  more active;more actively

B.  more active;more actively

C.  more active;the most actively

D.  active;the most actively

(   ) 9. Don't give up.      . So keep on practicing,and you'll make great progress.

A.  It's a piece of cake

B.  It serves you right

C.  Use it or lose it

D.  Practice makes perfect

(   ) 8. She seldom spoke English in front of class, for she was afraid        mistakes

      grammar.

A. to make;of B. making;of

C. to be made;in D. of making;in

(   ) 7. We often do lots of experiments in our       classes.

A. chemical    B. history

C. Chinese    D. physics

(   ) 6. Lucy was      excited      say anything when she heard the good news.
A. so;that   B. so;to
C. too ; to D. very ; to

(   ) 5. —-1 find it ’s too hard to learn English.

-Don't be too worried.       you learn, it will be.

A.  The more;easier

B.  The more;the easier

C.  The early;the easy

D.  The much;the harder

(   ) 4. Can you ―       the opening time on the Internet?

A. look for    B. look after

C. look at    D. look up