Can your brother ______ well

I think science is more useful than art.— . We think art is as useful as science.

It is thought that a new system _____ the place of the old one in that company. But things are getting worse and worse.

It was difficult being in a foreign country, ________ if you don’t speak the language

ividual human existence should be like a river-small at first, narrowly contained within its banks, and＿＿＿passionately past rocks and over waterfalls.