I think _______ a foreign language is not easy. You should _______ it often.A. to learn; to practiceB. learning; practiceC. learn; practicing
London, __________ capital of _________ UK, is a modern city.
When did your father ____ your mother?
He has been away ____.
—____ have you lived here? —Since last year.
—Have you returned the book to the library ____?—Yes, I have ____ returned it.