Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
#55993
A
only if
B
until
C
so that
D
even though
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Jenny enjoys reading and spends a lot of money on books __ she is not rich.
#55182
A
if
B
when
C
because
D
though
their problems can make them worry, I still have ways to help them out.
#56167
A
Because, so
B
Though, /
C
Either, or
D
Whether, or
--Would you like to go bike riding with us tomorrow? ---Sure, ____ I am busy.
#57365
A
since
B
unless
C
when
D
until