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 . This is______ I am writing this letter asking to be a volunteer. （用适当的词填空）

4 . Bob had seen the film before. That was ______ he did not see it yesterday. (用适当的词填空)

5 . Bruce did not watch the game last night. That was ______ he had to help his little sister with her homework. (用适当的词填空)

7 . 互联网最大的好处之一是能够消除距离感。(汉译英)
_______________________________________________________________________________________________

9 . This is why we’re here — to observe Tibetan antelopes. (英译汉)
_______________________________________________________________________________

10 . They also need to be ready to give ______ (interview) in English with international journalists. This is ______ they need an English trainer. (用适当的词填空)