When you are listening or reading, there will always be new words for you. Which of the following attitude towards new words are preferred by good language learners? (多选题)
选项：

A:I will look for clues and guess the meaning of the new words.;
B:I don’t need to understand every new word. ;
C:When one new word is really important to my understanding, I will look it up in a dictionary. ;
D:I will look up every new word in a dictionary.