The factory is usually noisy, ________ it is pretty quiet today.
Help others, ________ you'll feel happier.
(2018保定竞秀区二模) Last night I stayed up too late, ________ I'm really sleepy now.
(2018长春改编) Work hard and be patient, ________ your dream won't come true.
It’s hard for us to say goodbye we have so many happy days to remember.
A.so B.because C.although D.until
Mr. Black walked around and offered help ________ we were doing an experiment.
A.although B.when C.until D.unless
