On Sunday , my father often plays chess ______ my mother cooks meals
A. and
B. while
C. but
D. so
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My aunt will come to see me ______ she is free tomorrow .
A. if
B. until
C. while
D. as
The new manager will have an interview with a reporter ______ he arrives at the airport .
A. as soon as
B. until
C. while
D. than
We should do everything to protect the earth ,_______ we will lose our home .
A. and
B. for
C. but
D. or
Althoudh it's raining ,_________ they are still working in the fields .
A. /
B. but
C. and
D. so