Oh,where is my wallet?Maybe I left it in the car.—You______ things behind!

How strange _____ is that the students are so quiet in the classroom!

Measures must be taken before there is another collapse of the coal mine, ______?

____________ great fun it is to have a picnic on such a warm sunny spring day!

People who can’t ________ between colours are said to be colourblind.[ ]