英语翻译1,be ready to do 2,at the top of 3,in the center of 4,at

英语翻译
1,be ready to do 2,at the top of 3,in the center of 4,at the bottom of 5,make sure
1,This feeling had long been __________his heart.
2,He looked behind him to ____________he was not being followed.
3,Alison stood___________a large group.
4,He_________come to a decision.
5,I looked up and found he was standing_______________the stairs.