Whatever he does, once he set up a goal, he would start pursuing it without _________.
They soon ______ doing the same thing day after day, and finally gave up.
I like to listen to music ______ I’m having a walk in the evening.
______ the terrible pollution, so many beautiful fish are fast disappearing in the river.
All of us found ______ difficult to work out the maths problem.
Doyouhappentoknow________?