Choose the word or phrase that is CLOSEST in meaning to the part in each of the following sentences

IV. Choose the word or phrase that is CLOSEST in meaning to the part in each of the following sentences.
1. The achievements of science and technology of recent years have influenced the careers of many people.
A. markets B. trades C. professions D. hands
2. English and French are official languages in Canada.
A. main B. formal C. primary D. popular
3. There is still room for improving in your work.
A. space B. place C. area D. accommodation
4. The first experiment was unsuccessful, so we need to do another one.
A. managed B. bored C. failed D. damaged