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—May I smoke here? 

—If you ______, choose a seat in the smoking section．

A．should         B．could         C．may         D．must

—May I smoke here?    —If you _____, choose a seat in the smoking section.

---- May I smoke here?
--- If you      , choose a seat in the smoking section.

--- May I smoke here?

--- If you       , choose a seat in the smoking section.

A．should         B．could       C．must          D．may

—May I smoke here?    —If you _____, choose a seat in the smoking section.

A．should            B．could             C．may              D．must

---- May I smoke here?

--- If you      , choose a seat in the smoking section.

A．should            B．could             C．must             D．may

—May I smoke here?

—If you ________, choose a seat in the smoking section.

—May I smoke here?
—If you ________, choose a seat in the smoking section.

--- May I smoke here?
--- If you       , choose a seat in the smoking section.

--May I smoke here?

--If you _________, choose a seat in the smoking section.

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