________hard you try,it is difficult to lose weight without cutting down the amount you eat. (2012·湖南,32)
Nobody enjoys ______.
______ metals are good conductors, silver ______ the best conductor of all.
Instead, he seemed to see Tom ’s face, with the wide smile he ______ whenever he told a joke.
----- I can ’t see the words on the blackboard clearly. ----- Why, your eyes need _____ perhaps you need _______ glasses.
The typewriter _______ there all week.