(2019天水)I tried calling you, ________ your phone was out of service.
A.and B.but C.so D.or
(2019连云港)________ we didn't win the basketball game, we were satisfied with our hard work.
A.If B.Though C.Since D.Because
(2019苏州)Love your parents ________ they are alive. Don't wait until it is too late.
A.while B.though C.because D.unless
(2019滨州)Emily, you're playing video games again!Study hard,________ you will fail in the coming exam.
A.then B.so C.and D.or
(2019安徽)Our business won't improve ________ we offer better services to our customers.
A.because B.unless C.after D.since
(2020原创)I respect my parents, ________ sometimes I just can't agree with their old opinions.