补全英语短文,有首字母

补全英语短文,有首字母
It is well known that man is much cleverer than any animal.But which is the cleverest a__1__ the animals?Some scientists t__2__ it should be Alex,an African grey parrot.He is unlike any other animal.He can really t__3__ with people!
When he says"come here",he really w__4__ someone to come up to him.
"Alex is as clever as a c__5__ of 2 or 3 years old"says Dr.Pepperberg."He does just repeat the s__6__ he has been taught He u__7__ the words!"
Alex can tell about 50 d__8__ things,name 7 colours and count from 1 to 6.Is the parrot actually thinking in the w__9__ how man does?Nobody can say.But the q__10__ very interesting."