Afternoon tea was introduced in England by Anna, the 7th Duchess of Bedford, in the year 1840, _____ the evening meal was served fashionably late at 8 o’clock, thus _____ a long period of time between lunch and dinner.

__ the normal condition, he canread 150 words a minute.

It’salready10o’clock. Iwonder howit _________ that she was two hours late on such a short trip.[ ]

下列各组句子中，加点词的意义和用法相同的一组是（ ）

I really don’t know how to thank you enough. — _____.