It’s two years since they ____ each other， and they are going to get married next month.

I know it’s normal for such a thing to happen，but we________it if we’d been more careful

He likes the novel in ____, for his wife wrote it when she was alive. [ ]

It was not until the subprime loan crisis (次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.

I’ll go to visit my aunt in England ____ the summer holidays start.