—What's the key to success, Dad?
—More time and hard work, ________ you'll make it one day.
句意：——爸爸，成功的关键是什么？——多花点时间，多努力工作，总有一天你会成功的。
考查连词辨析和“祈使句，and/or+陈述句”结构。and并且；although尽管；but但是；or否则。此处构成“祈使句，and/or+陈述句”结构，分析前后句，构成并列结构，所以用and。故选A。
—What's the key to success, Dad?
—More time and hard work, ________ you'll make it one day.
Alice can sing some English songs, _______ she can’t play the guitar.
You must make sure your mask (口罩) is clean ________ you put it on.
_________he was poor himself, he tried his best to help the people in need.
______you smile at others, they will smile back.
—Michael, shall we go hiking in the mountains next Sunday?
—OK, ________it rains heavily.
The young men all shouted “Happy New Year” _______it was twelve o’clock.
You’d better tidy up your room ________ your father comes back.
A break between classes is very important for students because it ________helps with students' health by doing sports _______improves their social skills by communicating with their classmates.
You'd better make a good plan you take a holiday.
