Hello everyone, Could you please help me with these two questions from a test paper: 1. As is expected, it will still be some years before the metro line in our city _____ into practice. A.is put B.has been put Question 1: I know "A" should be correct. Then what about "B"? 2. As is expected, it will still be some years before all the metro lines in our city _____ into practice. A.are put B.have been put Question 2: Are both "A" and "B" correct? If so, which one sounds better? (As a side note, I'd say "...put to use" or "...put into operation", instead of "...put into practice". Am I right?) Thanks a lot in advance!