photo的复数 What are your brothers?They are both ---------(policeman)
-------(work) hard ,or you will fail in the coming exam.
--------(pass）me the mask ,will you?
MAY i -------(climb)the tree?
Can the vistors-----(feed)the birds in the cages?
Must we ------(wait)in a line to get on the bus?
YOU mustn't--------（bring）your bag into the supermarket.