In a new study of African elephants，researchers havefour distinct characters that are among a group.

Harry Potter is an____book forchildren, but my cousin doesn’t seem at all_____in it.

Mr. Smith has taught for many years and he teaches well. All the students ______ him.

_______ the global economy is showing signs of recovery, many developing countries are still suffering.

NooneexceptJackandTom _____theanswer.