Insert the missing prepositions where necessary. 1. Marina and Ivan are......Expo20.

Insert the missing prepositions where necessary.
1. Marina and Ivan are......Expo20.
2. Anna Petrova is . . . . . . the banking business.
3. Maxim works . . . . . . an international financial company.
4. This gentleman is......charge......marketing.
5. Who is responsible . . . . . . production?
6. Will you introduce me . . . . . . your boss, please?
7. This is Mark Douglas......DPC.
8. The meeting starts......5 pm.
9. I study English three hours......a day.
10. She always sits . . . . . . the vice president.