Once in a while I visit my grandparents on the farm and stay there for some days.

It isn't cold outside. You.......wear a coat.

As soon as I........my report, I'll call you and we'll go to dinner.

Nam (A) asked Mai what (B) can he do (C) to help (D) her.

The primary causes of species extinction are........destruction, commercial exploitation and pollution.

My impression of him was that he was a very capable person.

Credit cards.....in international trade are very convenient.

You're the worst guitarist in the world.

The 22nd SEA Games consisted of athletes from eleven.....countries.

Polluted water and increased water temperatures have driven many species to the verge of extinction.

Laura is telling Bob about her exam results.

~Laura: "..............."

~Bob: "That's great. Congratulations!"

What is the main topic of this passage?

It can be inferred from paragraph 1 that in the 19th century,..........

Humans depend on species diversity to have food, clean air and water and fertile soil.......agriculture.