Use the correct form of the present simple or the present

Use the correct form of the present simple or the present perfect simple to complete the sentences.
1. Ive just read (read) an interesting article about the special abilities of "autistic savants".
2. Stephen Wiltshire _________ (paint) beautiful pictures since he was eight.
3. About 10% of children diagnosed with autism ________ (show) some special talent.
4. Theres an Australian autistic savant, Daniel T, who speaks seven languages, and ________ (create) his own language.
5. Scientists ________ (study) Daniels talents for some time with great fascination.
6. When he is not working, Daniel _________ (love) hanging out with friends.