下面漫画中的这种做法（ ）
The study of natural history is not something to be left to biologists. In fact, their capacity _____ the time they can spend away from their offices is very limited.
Nobody but doctors and those _______ by Dr Smith ______ to enter the patient’s room.
It is amazing that the little boy can swim ________the river ________100 meters in width.
According to the recent research, heavy coffee drinking and heart attack is not necessarily ______ and effect.
What ________surprise you gave us by wearing such funny________ at so serious a meeting!
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