单项选择题

"Where can I find Jim" "He is ______ his work. He won’’ t leave the lab until 6:00 p. m."

A．on
B．over
C．at
D．under
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单项选择题
You have to be ______ when you try to work out mathematical formulas.
A．reasonable
B．rational
C．logical
D．sound
单项选择题
Ifs no good ______ him. He is always indifferent towards other’’s matters.
A．to turn to
B．turning to
C．turn to
D．turned to
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