______ the terrible pollution, so many beautiful fish are fast disappearing in the river

the earthquake I went there, I saw the whole town , and now everything has changed.

We can’t besuccessful ________ we keep working hard.—I agree withyou.

Not only you and I but Peter, the top student in our grade, ________ not able to solve the problem[ ]

It’s raining heavily! Why mustwe go out right now—- The reason is that we are going tohelp the villages on the mountains.—- ______.