He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.
There was _____to prevent the accident . A something could doB anything we could do C nothing we couldn’t doD nothing we could do
---- Is Mary coming to the concert? ---- I think ________.
---- Have you been here long? ---- _______.
________ mud on his trousers brushes off easily.
The young lady was careful _________.