下列各组词语中，加点的字音和字形全部正确的一项是（ ）（3分）

Only when _____ be possible to sign the contract.

__________ has been announced, we shall have our final exam next month

Because of the financial crisis, days are gone ________ local 5star hotels charged 6,000 yuan forone night [ ]

Today impressionist paintings are accepted as the beginning of ______ we call “modern art”.