1. (2021九上·哈尔滨开学考) Every winter heavy smog(烟雾) usually hits Harbin. All primary and middle school students don't have classes during the smoggy days. What should we do to prevent the smog harming us in this weather?

⑴Open the window and let fresh air in.

⑵Eat more fruit and vegetables.

⑶Do more outdoor sports, such as jogging and playing basketball.

⑷Wear a mask over mouths and noses when we go outside.

⑸Stay inside as much as possible instead of going outside.