7.Thirdly,__________.

6.What is more__________.

5.The main reason is________.

4.There are many reasons explaining_________.

3.It is true that_________.

2.What amaze us most is_________.

1.Recently,__________.

10.[解析]选D。考查动词辨析。由上文“It was true that you often left the keys in your study”及本句中表示转折的连词But可知：没有一把钥匙能打开保险箱。open作动词时，意为“打开”。故选D。

9.[解析]选A。考查形容词辨析。由其下文“I always think you are a good girl. And I often leave my keys in my study. ”可知句意为“你错了，卡特小姐”。wrong错误的。故选A。

8.[解析]选A。考查连词的用法。由语境知句意：但我认为你不信任我。表示转折关系，用并列连词but。故选A。