I really don’t know how to thank you , but for your help, I ______ my lost necklace．

.He has just arrived, but he talks as if he _____ all about that.

—        you please write a 3 000word report about this subject for me?—Perhaps I       only write a 1 000 word one,but I even doubt it.

How I wish every family _____ a large house with a beautiful garden!

—Did you visit the famous cultural relics last month?—No, we____ it, but we spent too much time shopping．