用所给单词的适当形式填空。
1.It’s never too old to learn. Karl Marx began to learn English in his _______(forty).
2.We should be brave when we meet illness and _____________(difficult).
3.Learning some knowledge of psychology is _____________(value)to all the teachers.
4.We__________(simple) can’t wait for the fashion show tomorrow.
5.Mr Brown will give some________(speak)on how to improve English next week.
1.forties 2.difficulty 3.valuable 4.simply 5.speeches