We can enjoy the books in the reading room, ________ we can't take them out.
The city is covered with fog and haze more often than ever, ________ we must take actions to stop it.
(2019吉林省卷)On school nights, I either do my homework ________ read books. I never watch TV.
(2019安徽改编)Our business won't improve u ________ we offer better services to our customers.
—My parents are crazy about Beijing Opera. How about your parents?
—________ my dad ________ my mom likes it. They prefer soft music.
A.Neither; nor B.Both; and C.Either; or D.Not only; but also
My father had so much work to do yesterday, and he didn't come back ________ I fell asleep.
A.until B.as C.unless D.when
