Вопрос по английскому языку:

Выберите правильную неличную форму глагола (инфинитив или герундий).
1. We must _______ you that your payment is overdue.
a. inform b. to inform c. informing
2. We have _______ overtime.
a. do b. to do c. doing
3. Do you mind _______ the window?
a. open b. to open с. opening
4. Catherine managed _______an important customer.
a. acquire b. to acquire c. acquiring
5. We look forward to _______ from you soon.
a. hear b. hearing
6. Jane is busy _______ invitations for our company's anniversary celebration.
a. write b. to write c. writing
7. Could you let me _______ my sentence?
a. finish b. to finish c. finishing
8. It is hard _______ certain customers.
a. please b. to please c. pleasing
9. Let me begin by _______ you something about our company's history.
a. tell b. to tell c. telling
10. We risk _______ a lot of money.
a. lose b. to lose c. losing