(2019原创)Jenny didn't go to bed ________ her mother came home last night.

A.though B.if C.while D.until

(2019原创)Find ways to get on well with your classmates, ________ you will get yourself very lonely.

A.but B.so C.and D.or

(2019原创)________ summer ends and autumn comes, the days get shorter and shorter.

A.If B.As C.Though D.Before

(2019原创)I'd like to go with you,    ________ I have many other things to do.

A.and B.but C.or D.so

(2019原创)All students were doing their DIY work ________ the teacher came in.

A.when B.since C.before D.after

(2018邯郸二模)You must treat your school work seriously ________ you want to go to the key senior high school.

A.unless B.if C.though D.because

(2018秦皇岛二模) My mother has taught in this school ________ our family moved to this city.

A.for B.until C.because D.since

(2018张家口桥西区一模)It was dark at that time, ________ I couldn't see what had happened.

A.and B.but C.or D.so

(2018石家庄一模)We should give the boy another chance ________ he has made a mistake.

A.though B.when C.unless D.because

(2018云南)We don't know the love of our parents ________ we become parents ourselves one day.

A.until B.after C.when D.since