1 . 我不但能够提高我的口语，而且可以学习西方国家的一些习俗。
Not only ______________________________ but also I learn some customs in Western countries．

2 . 有些人浪费食物,而其他人却没有足够的食物吃。
Some people waste food ________ ________ ________ ________ ________ ________ ________.

3 . Small amounts of caffeine — a cup ________ two of coffee a day — seem safe for most people.（用适当的词填空）

4 . I work not because I have to, ________ because I want to.（用适当的词填空）

5 . 有些人浪费食物，然而有些人没有足够的食物。（while）
Some people waste food ______ ______ ______ ______ ______.

6 . Jordan’s skills were impressive, but the mental strength that he showed made him unique.（but引导并列句）
The watch is cheap, ___________.
这块表虽然便宜，但走得很准。

9 . 我喜欢唱歌，而她喜欢跳舞。
I like singing ________ ________ ________ ________.