补全对话。
A:____I help you ?
B: Yes, do you have ____T-shirts?
A: Yes, we do. What ____do you want?
B: Yellow.
A: It's just ____for you.
B: ____is it？
A: It's 25 yuan.
科学实验必须按规范进行操作，下列实验操作中规范的是（ ）
