Fill in the blank with a suitble connector (however, but, therefore, so) 

He had written to her many times;_____  , she didn't give any reply. _____, they had been out of touch ever since.

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The first part of the test was easy; the second, ________, took hours.

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This is an expensive ________ very useful book.

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He has done nothing to prepare for the final examination, ______ played.

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___ hard he worked, he couldn’t earn enough money to support his family.

Fill in the blank with a suitable connector (however, but, therefore, so)   

This is the shortest way to the city center,  ______ it is not the only way.

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________ long it takes, I will wait for you. 

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Everyone ________ Tom is ready for the discussion.