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21. _________without friends ___________ the most difficult challenge for Chuck while living on the island.
A. How does he survive ... are B. How to survive ... are
C. How does he survive ... is D. How to survive ... is
22. ________ new buildings will be built in my hometown.
A. A great deal of B. A lots of C. A plenty of D. A great number of¸ß¡î¿¼¡á×Ê¡âÔ´€Íø ¡î
23£®The house is beautifully built ________ its high chimney.
A. except B. except for C. except that D. besides
24. They were surprised that a child should work out the problem _______ they themselves couldn¡¯t.
A. once B. then C. while D. if
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