The growth of part-time and flexible working patterns, ____more women to take advantage of employment opportunities.
A. have allowed
B. allow
C. allowing
D. allows
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“Politics ____ much more difficult than physics.” said Einstein.
A. is
B. was
C. are
D. were
The rest of the water in that well ____ .
A. are polluted
B. pollutes
C. is polluted
D. pollute
Neither Tom nor his parents ____ at home.
A. are
B. is
C. being
D. be
The police ____ a thief all around the building.
A. is searching
B. are searching
C. searches
D. search