Rheumatoidarthritisisanautoimmunedisorderthatcausesstiffnessandpaininthe______.
A. connections
B. back
C. head
D. joints
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Patientsshouldconcentrate______improvingcommunicationwithyourdoctor.
A. on
B. in
C. at
D. by
Thelandfillsitecontains_______bagsofmedicalwaste.
A. countable
B. countless
C. counting
D. counted
Hisdoctor______hemayhavestomachulcerbutisnotsure.
A. doubts
B. worries
C. suspects
D. concerns
Therewasa(n)_______ofthreemonthsbetweenthetwoheartattacks.
A. interval
B. range
C. distance
D. extent