Our teacher often tells us ________ in the river. It’s dangerous.

How long have you _e _____ the bike over ther—For two days.

Are you coming to Tom’s party?—I’m not sure. I______ go to the concert instead.

What do you think of the environment in our city— I am sure it _________ greatly through our work in the near future.

We should ____ for possibledelays on the motorway and leave an hour earlier. [ ]