This river is seriously polluted now,but once inside it ______. [ ]

The manager， it clear to us that he didn’t agree with us， left the meeting room.

How do you think we can keep fit–Err, I _______________ doing morning exercises every day.

The mediumbelieves the price of petrol will rise by more than two percent.

Has Jim known the good news—Not yet. I will tell him about it ________ he comes back.