A cat, ______ it is a white one ______ a black one, is considered to be a good cat as long as it can catch mice. 

---Did you hear the rain? ---______ .

--- I feel nervous about the coming summer.---- Me , too. Hot weather _____ makes people feel hot, ______ causes serious health problems.

John, work hard ________ you will make much progress.

       you have talk to him  , you will find he is a good  person.