______ you make a promise, you should keep it. 

—Do you think the weather will be all right in the coming summer vacation?—No,        we’re lucky. The newspaper says it’ll be very hot anyway.

 Start out right away, ________ you’ll miss the first train.

________ is the most important for him is not his job, but his family.

__ __ many Chinese women have received higher education, there are still obstacles that prevent them from enjoying the same opportunities for education and employment as men．