1. Breakfast **is** **serving** in Pierrot's Restaurant **between** 7 **and** 9:30 a.m.
- **B**: serving → served
- Corrected: Breakfast **is served** in Pierrot's Restaurant **between** 7 **and** 9:30 a.m.

2. Jose **had** her passport **steal** on **a** train **in** Italy.
- **B**: steal → stolen
- Corrected: Jose **had** her passport **stolen** on **a** train **in** Italy.

3. **Some** trees have **planted** **by** the gardener **already**.
- **B**: planted → been planted
- Corrected: **Some** trees have **been planted** **by** the gardener **already**.

4. Some days ago I **had** **my teeth** **checking** **by the dentist**.
- **C**: checking → checked
- Corrected: Some days ago I **had** **my teeth** **checked** **by the dentist**.

5. **These** pills **should** be **taked** every **four hours**.
- **C**: taked → taken
- Corrected: **These** pills **should** be **taken** every **four hours**.

6. **The** letter should **been** **delivered** **in the afternoon**.
- **B**: been → be
- Corrected: **The** letter should **be** **delivered** **in the afternoon**.

7. The mail **has sent** **to** the **wrong** **address**.
- **A**: has sent → has been sent
- Corrected: The mail **has been sent** **to** the **wrong** **address**.

8. When he arrived **at** the **furniture** shop, they **had been sold** the table he **wanted**.
- **C**: had been sold → had sold
- Corrected: When he arrived **at** the **furniture** shop, they **had sold** the table he **wanted**.

9. The **first** May Day **celebrated** **in** England in **1890**.
- **B**: celebrated → was celebrated
- Corrected: The **first** May Day **was celebrated** **in** England in **1890**.

10. **In many** universities, classes **taught** in English **though** the **native** language isn't English.
- **B**: taught → are taught
- Corrected: **In many** universities, classes **are taught** in English **though** the **native** language isn't English.

11. Hamlet **was** **wrote** **by** William **Shakespeare**.
- **B**: wrote → written
- Corrected: Hamlet **was** **written** **by** William **Shakespeare**.

12. **Every** possible effort **were made** by the orphanage **to find** the **boy's** parents.
- **B**: were made → was made
- Corrected: **Every** possible effort **was made** by the orphanage **to find** the **boy's** parents.

13. This class **has canceled** **because** **few** students **had registered** before registration closed.
- **A**: has canceled → has been canceled
- Corrected: This class **has been canceled** **because** **few** students **had registered** before registration closed.

14. The students **got** the librarian **buy** books **for** **them**.
- **B**: buy → to buy
- Corrected: The students **got** the librarian **to buy** books **for** **them**.

15. I **see** **that** chopsticks **are** widely **use** in China.
- **D**: use → used
- Corrected: I **see** **that** chopsticks **are** widely **used** in China.

16. I **like** your photos **of** wide animals. Where **did** they **taken**?
- **D**: taken → be taken
- Corrected: I **like** your photos **of** wild animals. Where **were** they **taken**?

17. Doctor Brown **will** **be given** you **some** useful **advice**.
- **B**: be given → give
- Corrected: Doctor Brown **will** **give** you **some** useful **advice**.

18. I **think** you **should** **be water** this plant **daily**.
- **C**: be water → water
- Corrected: I **think** you **should** **water** this plant **daily**.

19. Harry **is** going to **send** a postcard **for** Tom **tomorrow**.
- **C**: for → to
- Corrected: Harry **is** going to **send** a postcard **to** Tom **tomorrow**.

20. Lunch **is** **now** **be served** **in** the restaurant.
- **C**: be served → being served
- Corrected: Lunch **is** **now** **being served** **in** the restaurant.