Fill in the blanks using the correct form of verbs (present perfect) given within brackets. Since becoming an animal doctor, Doctor Dolittle 1. ____ (learn) to communicate with all animals and birds. He 2. ____ (treat) countless farm animals and pets with care. The parrot, Polynesia, 3. ____ (teach) him bird-language, and he 4. ____ (write) books about his adventures. Many people 5. ____ (bring) their sick animals to his door. Over the years, Dolittle 6. ____ (become) renowned worldwide for his unique abilities.
Since becoming an animal doctor, Doctor Dolittle ____ (learn) to communicate with all animals and birds.
has learned
He ____ (treat) countless farm animals and pets with care.
has treated
The parrot, Polynesia, ____ (teach) him bird-language, and he ____ (write) books about his adventures.
has taught; has written
Many people ____ (bring) their sick animals to his door.
have brought
Over the years, Dolittle ____ (become) renowned worldwide for his unique abilities.
has become
Explanation
(1) Subject 'Doctor Dolittle' is singular, so use 'has' + past participle 'learned'. (2) Subject 'He' is singular, so use 'has' + past participle 'treated'. (3) Both subjects 'Polynesia' and 'he' are singular, so use 'has' + past participle. 'Teach' becomes 'taught', 'write' becomes 'written'. (5) Subject 'Many people' is plural, so use 'have' + past participle 'brought'. (6) Subject 'Dolittle' is singular, so use 'has' + past participle 'become'.