Mr. Wang, who _____ in this city ever since thirty years ago, _____ a report for the last two years.

Could you give me some advice on travelling-Take a map with you ______ you have a guide or you know the city well．

From the dates _________ on the gold coin, we decided that it was made five hundred years ago.

Are you a teacher of English–No, but I ___________.

I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.[ ]