My mother stayed at home, and spent mush of her time in gardening.
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His total ___of the subject is truly surprising.How come he knows nothing about it?
A. unknown
B. knowledge
C. arrogant
D. ignorance
If one child gets sick with chicken-pox, the rest of the children in the same kindergarten will be exposed to the danger of being ___.
A. infected.
B. hurt
C. affected
D. effected
Clear skies are no ___of continued fine weather; it may rain in the evening.
A. sign
B. guarantee
C. clue
D. trace
It is the hospital's policy to___ any patient who is suffering from an infectious disease.
A. differentiate
B. distinguish
C. isolate.
D. separate