(2019承德县一模)It's polite to avoid making noise ________ you're eating.
A.unless B.until C.after D.when
(2019石家庄41中一模)I didn't pass the exam ________ I worked hard.
A.since B.unless C.though D.whether
(2019石家庄44中二模)He ate a lot and did little exercise ________ he gained 10 pounds in a month.
A.but B.or C.and D.so
(2019石家庄40中二模)Mr.Smith didn't give us a lecture ________ he was ill in bed.
A.until B.though C.because D.unless
(2019邵阳改编)Let's go climbing Langshan Mountain this Saturday ________ the weather is fine.
A.though B.if C.unless D.because
(2019天津改编)She was tired, ________ she continued her work.
A.so B.and C.but D.or
