I knew we would be friends ____ I met you on campus. [ ]

Can you think of some cases______ drivers obviously knew the traffic rules but he didn’t obey them.

__ _______ mon whether you put your heartinto it．

Was it what he said or something that he did ______ made you cry so sadly，Sarah?— No，not really

Now more and more people prefer __________ to _________ in order to reduce the air pollution.