28（）
A. petrol
B. advice
C. glass
D. glasses
30（）
A. at
B. in
C. on
D. with
George went to the air torte training school because he wanted（）
A. to fight the war
B. to fly
C. to be pilot
D. to be a passenger
The author's major conclusion about mistakes in foreign language learning is that（）
A. mistakes are not important in the process of learning a language
B. learners are often very afraid of making mistakes
C. making mistakes can help the learner discover the roles
D. native speakers often do not tell foreign language learners about their mistakes
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