一道英语完形填空！there are many words in the English language.you wi

一道英语完形填空！
there are many words in the English language.you will never the___meaning of every word in English.when you read you will often find many___you do not.you will not have enough time to___reading and try to find every new word in a dictionary.
sometimes you can___a new word because you know some of the parts of the new word.for example,if word ends the ____ letter "er" ,that word___be the name of a___or a thing that does a certain action .a writer is a person who writes .___it is not___to konw the parts of a new word to understand it ,___it will heip you many times.
1.A know B learn C find D look up
2.A books B letters C stories D words
3.A stop B enjoy C keep D start
4.A find B get C study D guess
5.A in B off C up D by
6.A can B might C should D must
7.A friend B boy C person D girl
8.A then B now C yet D sometimes
9.A helpful B useful C enough D good
10.A but B and C so D for
最好是有答案，没答案自己答也行，只要信得过。