单项选择题

(Those of us) who work in chemical (laboratories), should have (their) lungs (checked) quite regularly.

A．Those of us
B．laboratories
C．their
D．checked
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单项选择题
He went to the library (and) spent the whole afternoon there (to look) for (material) for an article (on) Shakespeare.
A．and
B．to look
C．material
D．on
单项选择题
The (first) Olympic (Games) (in) modern (time) took place in 1896.
A．first
B．Games
C．in
D．time
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