根据所给汉语和句子意思，用英语补全句子。
1.As we all know, waste water and gas ______________________(对……有不良影响)the environment.
2.A pair of pandas __________________(赠送)to Australia months ago, which represents the friendship between Australian and Chinese people.
3.---Do you often use Baidu ?
---Yes, it’s one of ____________________________(最受欢迎的)Internet search engines.