【推荐1】We saw several natives advancing towards our party, and one of them came up to us, to ________ we gave some bells and glasses.(用适当的词填空)

【推荐2】Previously, water quality in the Li River had suffered greatly from an increasing volume of tourists, many of _________ frequently threw garbage into the river. (用适当的词填空)

【推荐3】In our class there are 46 students, ________ half wear glasses.