We put down a ______ on a house yesterday
A. certificate
B.receipt
C. recommendation
D. deposit
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X-rays were discovered by a German scientist_________name was WilhemKonradRoentgen.
A. his
B.the
C. whose
D.her
The patient had appendectomy(阑尾切除术),_______means surgical removal of theappendix.
A.it
B.that
C. when
D.which
Having fully recovered after three months' stay in the ENT ward, he was______ the hospital.
A.sent into
B.charge
C.freed from
D.discharged from
Anything________is invisible to the naked eye is said to be microscopic(微小的).
A. which
B. that
C. who
D. It