根据句意、汉语或首字母提示写出单词。

1． Do you know the saying, “A friend in need is a friend ________（真正地）?”

2． Why not sing the song with your mouth fully ________ （张开）．

3． I think it’s our_________（职责） to protect the environment．

4． If we keep _________ （砍伐）down the trees, wild animals will have nowhere to live．

5． －Can you  ___________（描绘）the attacker to the police ? －He is tall and strong．

6． Miss Lu is often __________ （邀请） to give us talks on teenagers’ education．

7． Shanghai is so big that we can get lost ____________（容易地）in it．

8． Most people like wearing clothes m________ of cotton．

9． My father has b________ to the USA twice．

10． They met a storm with t__________ and lighting on their way to school．

11． I hear they are both going on a trip． So I hope they’ll enjoy t___________．

12． If you try your b__________ to learn English, you’ll be better at it．

13． She speaks e___________ French．

14． It’s too t________ to finish the 100-kilometre trail within 48 hours．

15．October ,1^st ,2009 will be our motherland’s s___________ birthday．