单项选择题

(Electronic) mail to describe an upcoming workshop (should use) only (if) potential participants use this form of communication (regularly).

A．Electronic
B．should use
C．if
D．regularly
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单项选择题
This is the (longest)flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for)13 hours.
A．longest
B．have ever taken
C．had flown
D．for
单项选择题
Though the doctors tried everything they couldn't save him from the deep ______wound.
A．shot
B．punch
C．pinch
D．stab
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