单项选择题

Customers (are asked) to ensure that they (have given) correct change before (leaving) the shop as mistakes cannot be (afterwards) remedied.

A．are asked
B．have given
C．leaving
D．afterwards
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单项选择题
The new technology has (made possible) for the doctor to (make) diagnoses (without seeing) the patient in (person).
A．made possible
B．make
C．without seeing
D．person
单项选择题
Even at discounted prices, these powerful AIDS drugs are far beyond ______ for most of the world's 40 million HIV-infected people.
A．reach
B．control
C．comprehension
D．imagination
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