The act that was passed by Congress requires states to wait until 2017 before they can apply for opt-outs.

已经国会批准，该方案要求各州至2017年才能申请弃管医保。

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Depending on your circumstances you can opt for one method or the other.

根据自己的情况，你可以选择这种或那种方法。

《柯林斯英汉双解大词典》

People still opt for monogamy and marriage.

人们还是选择单一配偶制和婚姻。

《柯林斯英汉双解大词典》

The EU must continue allowing for opt-outs, such as the refusal of the UK and Denmark to join the euro, but "they remain the exception, not the rule", he said.

BBC: Closer union 'urgent' - EU Commission chief Barroso

By postponing any decision until after the Scottish independence referendum, the London government has opened itself up to renewed criticism from the SNP that the only way for Scotland to get wider powers is for voters to opt for full independence.

BBC: Corporation tax move 'tough blow' for Stormont

Fans of a tweed sport coat with corduroy pants for the office should opt for the sporty feel of a button-down collar.

WSJ: Guide to Men's Shirt Collars: Which Styles Go With Which Occasions and Flatter the Face