The boy broke the rule ______ he got punished.

have any doubts about your health, you’d better______ your doctor at once.

Nobody could solve this difficult problem alone others’help．

(2013·厦门第一次质量检查)You had better book rooms at the hotel in advance ________ you should find no room on your arrival

Have you worked in this company for a long time—- Yes, since I _________ from the college.