1．(2019年江苏卷·阅读理解B)Yellowstone ________ (obvious) was of this second type，but Christiansen couldn't find the caldera anywhere.
2．(2019年北京卷·阅读理解B)However, her dad ________ (remind) her that sugary treats were bad for her teeth.
3．(2019年新课标Ⅰ卷·语法填空)However, biologists calculate that there are about 20，000－25，000 polar bears ________ (wide).
