1 . Of the nineteen recognized polar bear subpopulations, three are declining, six ________ (be) stable, one is increasing, and nine lack enough data.(所给词的适当形式填空）

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

3 . The topic is well worth talking about. We shall, ________ , return to it in the next lesson.

A．however

B．otherwise

C．besides

D．therefore

4 . It was a shame that I was ________ (beat) by a much younger man in English competition. (所给词的适当形式填空）

5 . I was glad to meet Jenny again, _______ I didn’t want to spend all day with her．

A．but

B．and

C．so

D．or

6 . We should advocate that smoking ________ (ban) on campus. (所给词的适当形式填空)

7 . — How did you like Nick’s performance last night?
—To be honest, his singing didn’t        to me much.

A．appeal

B．belong

C．refer

D．occur

8 . Eating more vegetables and fruits is b________to our health. （根据首字母单词拼写）

9 . In my view, high school students should keep a b________ diet and eat more fruit and vegetables instead of junk food. (根据首字母单词拼写)

10 . When he was running after his brother, the boy lost his ___ and had a bad fall.

A．balance	B．chance
C．memory	D．place