ⅰ.单项填空
1. in order to improve our standard of living we've got to ______ production and export.
a. put up b. turn up
c. show up d. step up
2. joe's application to the university was not accepted ______ his failing english.
a. instead of b. in spite of
c. due to d. thank to
3. only after the teacher explained it to me a second time ______ the question.
a. i did understand
b. did i understand
c. i had understood
d. had i understood
4. — you look so worn out. what's up?
— i ______ the spare room all morning. my cousin is coming tomorrow with his son to stay with us for the weekend.
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