Ⅰ.单句语法填空(高考真题改编)
1. (2019年天津卷)Tom is so independent that he never asks his parents' opinion ________ he wants their support.
解析：句意：汤姆很独立，除非他想得到父母的支持，否则他从不征求父母的意见。根据语境可知，这里用从属连词unless“除非”引导条件状语从句。
答案：unless
2. (2018年天津卷)Let's not pick these peaches until this weekend so ________ they get sweet enough to be eaten.
解析：句意：到这个周末我们再摘这些桃子吧，那样的话它们就甜得可以吃了。由空后的内容可判断，空处引导目的状语从句，故答案为that，即so that引导目的状语从句。
答案：that
