1 . 专家一贯提倡每一个人都从自身做起去保护环境，使我们的星球成为更宜居的地方。
Expert always ________ that each person should play their part to protect the environment, ________ our planet a better place to live in.

2 . 社交媒体充当了一个高效率传播信息的渠道。
It is social media ________ serve as a very ________ channel for spreading information.