【推荐1】It can take up ________ three months to teach a new song. (用适当的词填空)

【推荐2】Much ________ her embarrassment, she realized everybody had been listening to her singing. (用适当的词填空)

【推荐3】Wherever our interests may lie and whatever our career choices might be, work allows us the opportunity to be engaged________ something we are fond of, which gives us a great sense of achievement and satisfaction. (用适当的词填空)