1. They ___ (visit) their grandparents every weekend.

2. This task is ___ (more difficult/most difficult) than I expected.

3. If she ___ (have) more time, she could complete the project.

4. No sooner ___ (had he arrived/he had arrived) than the meeting began.

5. It is crucial that every participant ___ (be) present at the seminar.

6. I will wait here until she ___ (return).

7. This is the book ___ (that/which) I borrowed from you.

8. The manager insists that every employee ___ (be) punctual.

9. Hardly ___ (had she entered/she had entered) the room when the phone rang.

10. Not only ___ (did he solve/he solved) the problem, but he also explained it well.