用所给词的适当形式填空。每词限用一次。
be, not litter, pollute, drive, trade
【小题1】In fact, around 70 million sharks ______ in this industry every year.
【小题2】There are more and more disasters in climate in the past few years because people ______ the natural environment.
【小题3】To cut down air pollution, we should take the bus or subway instead of ______.
【小题4】The river used ______ so clean, but now it is really dirty.
【小题5】Please remember ______ everywhere and keep the public clean and beautiful for everyone.