根据句子意思，用括号内所给单词的适当形式填空。
You never know how much difficulty we had __________________(work) out the problem.
Luckily, we managed to solve it with Mr Wu’s help.
This book is very popular because of some powerful _____________(speak) we love.
The president said he had made no ____________(decide) on whether he would run for a second term in office.
No attention ______________(pay)to his new book at the book show last week.
He devoted all his life to _____________(create) a whole new language of painting.