(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
(2018沈阳)My grandparents wrote letters to keep in touch with others ________ they were young.
A.when B.since C.after D.before
(2018扬州)Hawking is no longer with us, ________ he will continue to inspire the world.
A.so B.if C.but D.as
(2019原创)Everyone should wait in line outside. You couldn't come in u________ your name is called.
(2019原创)T________ he is only seven years old, he knows a lot about science.
