欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

The time and effort he has devoted during the past few years _____ trees in that village are now considered to be very important.

As a student, you must ______ your teachers.

In my opinion, no search engine can     Baidu in search scope（處理，研究某事的范圍）

Sam         some knowledge of the computer just by watching others working on it．

This kind of cloth doesn’t    washing; its color will fade soon．

One island and two lakes _______________ the country.

This medicine will ____ him of his bad cold.

He has been working hard day and night, which, of course,      his tiredness.

The good thing about children is that they ________ very easily to new environments.