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 ,1st ,2009 will be our motherland’s s___________ birthday．
1．indeed 2．open 3． duty 4．cutting
5．describe 6．invited 7．easily 8．made
9．been 10．thunder 11．themselves． 12．best
13．excellent 14． tough 15．sixtieth