The teacher tried to a__________ the cause of our failure.
The little daughter has an __________ (想象的) friend, which is hard to believe for adults.
I think sunshine and fresh air are b__________ to your health.
The poor lady always wore the __________ (同一的) dress on all occasions.
Black and white show a striking __________ (对比).
When we __________ (呼吸), we draw air into our lungs.