–No wonder your boss blamed you. With all the work on hand, you ____ to the cinema last night.A shouldn’t have gone B mustn’t have gone C couldn’t have gone D shouldn’t go
______ 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.
This is the plane _______ he went to Shanghai ______ business.