21. have you heard _____ news？the price of _____ petrol is going up again！
a. the； the b. the； 不填 c. 不填； the d. 不填； 不填
22. ---may i borrow your bicycle for a day, david?
---oh, sorry! my bicycle is not ，and it is being mended.
a. legal b. available c. positive d. constant
23. __________ his great achievements in science, he still worked hard to do better.
a. even if b. despite c. because of d. although
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