1.The manager is so arbitrary and self-centered that he ofte

1.The manager is so arbitrary and self-centered that he often makes rude remarks regardless of other people's feelings.
2.Alliances with neighboring tribes are very important,because small isolated communities can be extremely vulnerable when they have to deal with emergencies.
3.The solar system is a stable arrangement of planets,comets and debris orbiting the sun,and it is probably one of many such orbiting systems in the universe.
4.Frank made his way to the door and was about to close it when he caught sight of a strange package lying outside the door.