Howling with laughter,even over……

英文题求教,填时间介词
14.late nigth,you can here coyotes howling in the distance.
15.just wait a second,i'll be there a minute
16.I need to give my parents a call.I haven't talked tothem over a monh.
17.Barbara is going to sart her new job next September.
18.the professor said the first day of the course that there would be a big final test the end of the semester.
19.I have been sitting here more than an hour.if they don't arrive the next ten minutes.i'm leaving

英语翻译
Howling,interestingly,is a contagious behavior．When one wolf starts to howl,very likely others will follow．This is often seen to occur in the morning,as if wolves were doing some sort of “roll call” where wolves all howl together to report their presence．
例如最后一句为啥用where引导 前面没有表示地点的名词啊