1．(2017·北京卷)____________ you don’t understand something, you may research, study, and talk to other people until you figure it out.
答案：If
2．(2016·浙江卷6月)____________ online shopping has changed our life, not all of its effects have been positive.
答案：While/Although/Though
3．(2019·安徽淮南月考)Little ____________ he knew about classical music, he pretended to be an expert on it.
答案：as/though
