【简答题】Good friends know how to keep a secret. If you tell them “Please, don’t tell anyone,” they’ll take it seriously. Don’t worry – your secrets won’t fly around the world. Toxic friends say things they sh...
【简答题】Have you ever posted letters to your friends or parents? If so, you must have put stamps on the letters before you sent them. But, how did people receive letters before stamps were invented, and who c...