1 . As we all know, reading classics is of great importance to us. This is ________________ it can not only improve our studies but also enrich our everyday life. (用适当的词填空)

2 . 很多年轻人来到这座大城市是因为他们想寻求幸福和成功。(the reason why...)
________________ they want to seek happiness as well as success.

3 . 事实是我们很幸运，随时都能得到干净的水，但世界各地的许多人并非如此。
__________________ we are lucky enough to have clean water whenever we want, but this is not the case for many people around the world.

4 . 这就是我一定相信你会保守此秘密的原因。
____________ I must trust you to keep this secret.

5 . The amazing thing about the spring is ________ the colder the temperature gets, the hotter the spring! (用适当的词填空)

7 . What matters to him is________ the job allows him to pursue his further study or not. (用适当的词填空)

8 . The reason for her preference for city life is ________ she can have easy access to shops. (用适当的词填空)

9 . The reason ________ he gave for his absence is ________ he was drunk.