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

—What do you think of your English teacher?

—I like him very much. He is ________ kind ________ hard­working.

A.either; or B.neither; nor C.not; or D.not only; but also

I would like to go shopping with you this afternoon,  ________ I feel very terrible now.

A.so B.but C.and D.or

You'd better practice your spoken English well ________ you go to America for further education.

A.before B.after C.because D.unless

(2019石家庄28中一模)They didn't continue to climb the mountain ________ the weather is becoming worse and worse.

A.because B.if C.unless D.though

(2019保定莲池区一模)Our school basketball team lost the match, ________ we still have confidence in them.

A.but B.or C.and D.so

(2019山西改编)You can't decide whether or not you like something until you try it, ________ it's important to try something new.

A.but B.or C.so D.and

(2019德阳)I'll send you a message ________ I get to school.

A.since B.so that C.as soon as D.though

(2019昆明)________ we continue to kill elephants for their ivory, we humans will lose them in the end.

A.If B.Before C.Until D.Although

(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