I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
----You must find one exam after another very tiring.---- ________. In fact, they offered me good chances to apply what I had learned.
We tried hard, and eventually, we were able to get Mike ____us his car just for a day.
Susan started to clean the room; __________Lily was preparing lunch.
----Why are your hands so dirty? ----I ____________in the garden.
---Why not open the windows to let _____cool air in?---I’d rather you didn’t. ________air in out town is terribly polluted.