1 . 门咔嚓一声锁上时，他突然想到自己把钥匙忘在了里面。
________________ he had left his keys inside just as the door clicked shut.

2 . It never __________ __________ me that perhaps he was lying.
我从没想到过他可能是在说谎。

6 . 拥有积极的态度并且充分利用竞争带给我们的好处是真正重要的事情。
Having a positive attitude and making full use of the benefits that competition brings to us are ________.

8 . 到目前为止，我最欣赏的是它的建筑。
I think ________________ most so far is the architecture.

9 . 令人惊喜的是，直到20世纪70年代，现代人才有人知道它们。
________________ no one in modern times knew about them until the 1970s.

10 . 给我印象最深的是，每当我遇到困难时，我的老师都会鼓励我克服障碍。
__________________ is that my teacher will always encourage me __________________ whenever I come across difficulties.