25、——why was our foreign teacher unhappy yesterday?
——news about the tsunami striking her country ____ an attack of homesickness.
a、set for b. set out c. set about d. set off
26. i had been looking for the book for two days _____ i found it at last
a. until b. when c. before d. while
27. ________ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
a. examining b. examined
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