1). People must be careful in the winter time, to avoid catching a flu.
2). Cars must always be prepared for the winter, including replacement of summer tires, verification of cooling system, and so on.
3). During hot summer days, people must drink at least 2, or even 3 liters of water.
4). Fruits and vegetables must be cleaned with plain water before consumption.
5). Nowadays, to be familiar with computers is a must.
Green eyes.
