________back at my middle school years,I regret not having worked so hard as I should have.
Always read the ___ on the bottle carefully and take the right amount of medicine.
—Have you ever visited the Opera House? —Yes.When I was in Sydney, I___it twice.
In recent years,___global warming is becoming___concern for people all over the world.
What I need is nothing but an interesting book,___ that can kill the time tonight
—How did you find the last night’s performance? —Wonderful! I’ve never seenone.