Scientists think they have _____ in their attempt to find the causes of some major dieases.
Having been out of touch with his parents for two years, John returned home,
Written in a hurry, ______. How can it be satisfactory?
--- Seems that Jack is very rich. He is always changing his cars. What is he? --- ______, but I am not quite sure.
They are just trying to reach a point ______ both sides will sit down together at the table.
______ at the news that her eyes rained tears.