1. By the time she arrives, we ________ (will finish/finished) our time-travel experiment.

2. If I ________ (knew/had known) how to operate the time machine, I would travel to the future.

3. The time travelers ________ (were/will be) exploring the ancient ruins when they discovered the hidden treasure.

4. Before she started her journey, she ________ (checked/had checked) the time machine's settings.

5. If you ________ (come/came) with me, we could have a fantastic adventure together.

6. The group of friends ________ (was/were) planning a trip to the mountains.

7. The cat and the dogs ________ (is/are) playing in the garden.

8. Neither the book nor the magazines ________ (has/have) been returned to the library.

9. Each of the students ________ (has/have) received a certificate of achievement.

10. My collection of stamps ________ (was/were) displayed at the exhibition.