题目

My son was playing with a bottle of bubbles. Dip the loop in the bottle, pull it out, and blow it to make bubbles. He understood the principle but was vainly _______ to blow bubbles. He would dip and dip and blow and blow, but alas, no _______. He _______ me the bottle and loop and asked me, “Daddy, can you make bubbles?” I hadn’t blown bubbles in years. I am a _______ by education, fairly well-trained in surfactant (活性剂) technology. However, all that knowledge is completely _______. I was having no more _______ than my son. I dipped and puffed, _______ no bubbles. 选字填空 在　　再 （　　）三　　　存（　　）