Deserts, dry areas with _____ no vegetation, cover more than one-third of the Earth's land surface.

What a terrible experience ! ________, you’re safe now —— that’s the main thing.

It’s always difficult to live in a foreign country, ______ when you don’t speak the language. 

Progress so far has been very good．We are,    __, confident that the work will be completed as expected．

-- Do you think it's a good idea to make friends with your students?--  _____  , I do. I think it's a great idea.