与“则芥为之舟”中的“为”意义和用法相同的一项是（ ）

Someone isknocking at the door. Is it Ann— It _____ beher. She is giving a performance at the theatre now.

If we sit near _______ front of the bus, we’ll have _______ better view.

Jack is in good_________ , because he eats ________food.

More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.