He realized his mistakes and took action to reduce theloss _______ it was too late.A．until

There are so many foggy days these years. We all wonder ______________________.

Tom and Jim are talking. We should tell them _______ noise while watching birds.

First, gradually increase a gentle walk to 20 minutes. This can be done every day or _____.

“All ______ present, and all ______ going on smoothly.” Said the secretary.