Is_______ necessary to learn another language? — I think so.

Jenny went into the room, took off her coat and ______ down on a sofa.

The 30th London Olympic Games will begin _______ 27th July 2012.[ ]

Mrs. Brown, I don’t think we can get there on time by bike. — You mean it’s ___________ for us to take a taxi?

Peter’s jacket looked just the same as Jack’s, but it cost ___________his.