bài 1: rewrite these sentences 

1 it's necessary for me to clean his table -> do I....?

2 she has just written an article about the accident -> an article....

3 we haven't eaten seafood since last summer vaction-> we.....

4 they haven't learned english for 2 years-> it's .....

5 she left without leaving any message-> she left

6 although his leg was broken , he managed to come on time ->in spite of......