At the end of the year 2010, some species of birds ddn’t survive the _____ winter in some European countries.

The black horse is _____ of the pair . 

-----How do you find your visit to the museum ?-----I thoroughly enjoyed it, it was ______ than I expected.

Though the situation is rather serious, financial leaders are still ______ about global economy.

---Look, our headmaster is over there, playing basketball with some students of our class. --- Oh, he must be ________ to his students.