During an earthquake, cover your head and neck under a sturdy table or against a wall, and hold on tight to that position; do not rush outside, stand near windows, or on easily falling objects such as cabinets or bookshelves, or use elevators; remain calm and move to an open area when the tremors stop, staying away from power poles, trees, and buildings.

1.It was hard to go outside during the heatwave last week

2. Air pollution in big cities can lead to serious health problems

1.Unless this store sells emergency kits,I'll check the other one

2.If you throw trash into the river,it will become more polluted

3.The factory is dumping waste in this lake,so it is polluted