1. The company specializes ..... marine insurance.
a) on b) in c) out d) by e) among
2. The broker asked the client to increase the margin ..... a high-risk rate.
a) in b) for c) by d) with e) on
3. She works ..... a firm that manufacturers electrical equipment.
a) between b) on c) for d) by e) among
4. The price of petrol is influenced ...... market forces.
a) in b) by c) among d) for e) at
5. How much do we need to spend ...... marketing?
a) on b) by c) among d) with e) between