完形填空。
There are many words in the English language. You will never    1   the meaning of every word in
English. When you read, you will often find many    2   you do not know. You will not have enough time
to   3   reading and try to find every new word in a dictionary.
Sometimes you can    4   a new word because you know some of the parts of the new word. For
example, if a word ends    5   the letters "er", that word    6   be the name of a    7   or a thing that does
a certain action (某个动作). A writer is a person who writes.    8   it is not    9   to know the parts of a
new word to understand it,   10   it will help you many times.
(     )1. A. know
(     )2. A. books
(     )3. A. stop
(     )4. A. find
(     )5. A. in
(     )6. A. can
(     )7. A. friend
(     )8. A. Then
(     )9. A. helpful
(     )10. A. but

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