(2013·吉林市期末，33)I’m told that languagepractising.com is a free website ________ learners can not just learn various languages but also chat online.

Yao Ming works hard on his English and ________

Now , in our country free medical treatment covers sickness of mind as well as sickness.

I have not seen him ______ he left

His suit looks ______ than the one I bought yesterday.