Here are the sentences completed with the correct verb forms:

1. The kids **surprised** their grandma for her 80th birthday.
2. There **was** a briefcase, a typewriter, and a tape recorder in the office.
3. Either you or your sister **is** to be asked to preside at the meeting.
4. The team **has just reached** a decision.
5. I **saw** your uncle and your cousin coming down the street.
6. **Did** either of the couches **expect** the team to win the game?
7. Neither I nor my sister **hope** to graduate in June.

Let me know if you need further information or assistance!