Choose the best answer to fill in each blank:
Flowers (I)______ in summer and leaves gathered in autumn can be pressed and used to make beautiful designs, while larger flowers and sprays of leaves can be (II)_______ in an (III)_______ natural state by drying them, which is best done in the open air. (IV)________ of dried flowers make really beautiful winter decorations and will sometimes last for year (V)_______ end. 
(V)
A.for
B.at
C.in
D.on

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