① wash____ ② clean____ ③ watch____ ④ do____
如图所示,某同学在两块相同的玻璃片上分别滴上一滴水,观察图中情景可知,该同学主要研究蒸发快慢是否与( )
—Could you tell me how ________ Wangfujing Dajie?
—Sorry, I'm new here. I'm not sure.