–Have you ever traveled abroad?--Sure. I ____ the language of English in the USA two years after I graduated from the university.
Farmers in Kaifeng grow a lot of peanuts every year, some of __shipped to foreign countries.
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