单项选择题

Dr. Hawking has made much contribution to the theories of modem physics at the （）of his health.

A．cost
B．disposal
C．mercy
D．expenditure

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单项选择题
The Mona Lisa, （）in Italy, is now in the Louvre, a museum in Paris.

A．who painted
B．who has painted
C．which painted
D．which was painted
单项选择题
People do not always recall events as they （）actually.

A．are happening
B．will happen
C．happened
D．would happen
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