1 . He then placed the hot stones in _________ empty oil drum with kau kau (sweet potato), ripe corn, and greens. (用适当的词填空)

2 . Well, if they really wanted to help Henry, they could offer him ________ essential job. (用适当的词填空)

3 . As ________ alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. (用适当的词填空)