We are at your service

We are at your service 请帮我解释：We are always at your service. we are holding the above mentioned case at your disposal we are on your we'resorrywe are unable to continue with your activation at this time汉语意思 --what are the rules at your school?--we can,t _____ casually.we can,t wear jeans to PE class. 激活苹果4出现we're sorry,we are unable to continue with your active at tis time we're sorry we are unable to continue with your action at this time.iTunes 上面显示这个换个卡还是 安装苹果We're sorry,we are unable to continue with your activation at this time 出现这个 ios7b2 出现 we are sorry,we are unable to continue with your actuation at this time怎么解决这个问题（无卡情况） We are at cshool We are school today We are at _____ service 24 hours a day.A.our B.his C.your D.its We are at your service.Do not__to turn to us if you have any further problems.为什么填seek We are at your service.Do not hesitate to turn to us if you have any further problems.求翻译 Are you good at your classmates?改错 （）sport are your classmates good at are your (p ) at home now? Are your p____ at home now?