She devoted herself _______ to her research and it earned her a good reputation in her field. 

I wasn’t blaming anyone; I           said errors like this could be avoided.

I was caught in the traffic jam this morning; ______, I would have come on time.

 Seeing the coach nodding ________ to her, the little dancer was no more nervous and went on with her performance.

(2013 ·湖北武汉武昌高三联考)Smiling doesn't ________ mean you're happy.Sometimes, it just means that you're strong enough to face problems.