We are learning English, but how can we learn English well? A student can know a lot about

We are learning English, but how can we learn English well? A student can know a lot about English, but maybe （可能）he can not speak English.
If you want to know how to swim, you must get into the river. And if you want to be a football player, you must play football.
So, you see, you can learn English only by using it. You listen to your teacher in class. You must read your lessons every day. You must speak English to your classmates and you must write in English，too. Then one day, you may find your English very good.
     12. You know a lot about English but maybe you     .
A. can’t speak it                    B. can write it     
C. can’t study it                   D. can use it
     13. You must get into the river     .
A. to learn how to swim            B. to play with water     
C. to go boating                  D. to catch a fish
     14. Do you want to be a football player? Please     .
A. put your football away        B. buy a good football    
C. play football                 D. watch others play football
     15. How can we learn English well?
A.We must have a good English book.
B.We must have a good English teacher.
C.We must see more English films.
D. We must use it often.A