1．(2019年天津卷·阅读理解B)I was ________ (extreme) inspired by the elegant way the words sounded.
2．(2019年北京卷·阅读理解C)These ________ (develop) are likely to make our current problems with robocalls much worse.
3．(2019年北京卷·阅读理解D)Ocean colour varies from green to blue, depending on the type and ________ (concentrate) of phytoplankton.
4．(2019年江苏卷·完形填空)Chris and Tim work at a zoo, helping endangered cranes with their ________ (reproduce)．
