a pack of wolves用is还是are

a pack of wolves用is还是are a pack of a pack of lies pack of unlock is required There ___ a group of people...用is 还是are? a lot of前面用threre is还是there are a lot of 前用is还是 are a small number of students后面用is 还是are? a pair of pants 后面用is还是are A pair of shoes ￥6.应该用is 还是are? is还是are a lot of balls 急!请问the couple of wolves 后面用单数还是复数?