They returned home after a long journey,___________________.

At first the institute refused to purchase(购买)  the  experiment  instrument,  but  this decision was ______ changed.

I’m worn out,____,the bike doesn’t work well,___ I can’t go further.

Attention, coffee lovers! We have for you, the best coffee machine ___ invented.

I'll be home late, but please don't stay ____ for me.