Edison asked his father why the hens could hatch eggs ___he couldn’t. 

I really wonder ______ he has posted me many parcels _____ we worked together . 

The suggestion          we should have a discussion on this problem is not the one ________he made. 

________it is hoped that college students should be equipped with the ability to take a good set of notes, this is not always the case． 

The weather was ______ cold that I didn’t like to leave my room.