relative clauses what vs which

1. The final announcement was not at all ______ we expected.
2. The old piano, ______ had been out of tune for years, finally got restored.
3. I can’t imagine ______ caused him to abandon the project so suddenly.
4. The suitcase, ______ was left unattended, caused a security alert.
5. You need to decide ______ course of action will be most effective.
6. The biggest surprise was ______ they revealed during the press conference.
7. The painting, ______ hung in the gallery’s main hall, was valued at over a million dollars.
8. Do you know ______ triggered the alarm last night?
9. The itinerary, ______ we drafted last week, needs to be reviewed by the team.
10. We’ll have to analyze ______ factors are influencing the market trends.
11. She didn’t understand ______ made her coworkers so upset.
12. His backpack, ______ contained all his important documents, was misplaced at the airport.
13. I’d like to clarify ______ you meant by “a more flexible schedule.”
14. The equipment, ______ was shipped from overseas, arrived damaged.
15. Let’s identify ______ goals are realistic within our current budget.
16. The biggest mystery is still ______ happened to the missing funds.
17. The laptops, ______ you requested for the department, should arrive tomorrow.
18. No one could believe ______ the final witness disclosed in court.
19. The letter, ______ my father received last week, contained unexpected news.
20. Could you explain ______ version of the software we are supposed to install?

Answer Key 

1. The final announcement was not at all what we expected.

2. The old piano, which had been out of tune for years, finally got restored.

3. I can’t imagine what caused him to abandon the project so suddenly.

4. The suitcase, which was left unattended, caused a security alert.

5. You need to decide which course of action will be most effective.

6. The biggest surprise was what they revealed during the press conference.

7. The painting, which hung in the gallery’s main hall, was valued at over a million dollars.

8. Do you know what triggered the alarm last night?

9. The itinerary, which we drafted last week, needs to be reviewed by the team.

10. We’ll have to analyze which factors are influencing the market trends.

11. She didn’t understand what made her coworkers so upset.

12. His backpack, which contained all his important documents, was misplaced at the airport.

13. I’d like to clarify what you meant by “a more flexible schedule.”

14. The equipment, which was shipped from overseas, arrived damaged.

15. Let’s identify which goals are realistic within our current budget.

16. The biggest mystery is still what happened to the missing funds.

17. The laptops, which you requested for the department, should arrive tomorrow.

18. No one could believe what the final witness disclosed in court.

19. The letter, which my father received last week, contained unexpected news.

20. Could you explain which version of the software we are supposed to install?