Teachers’ Day is a time to be________to all teachers who deserve special recognition

_____ three influenza type A virus subtypes（子类型） have been found in pigs．

Michael put on a picture of YaoMing beside the bed to keep himself _____ of his own dreams

He was determined to hold on to this job ___ difficulties he might run into.

Nowadays ______idea is always flashing across his mind that he should fix______timefor another trip with his family.