Here are the most suitable words or phrases for each blank in the sentences:

1. Mary __________ took Mrs. Thu to the party, is very friendly.
- **B. which**

2. I __________ T.V. at home when suddenly the doorbell rang.
- **D. was watching**

3. Joanna suggested __________ fishing this weekend.
- **A. going**

4. Neil Armstrong __________ was the first man walking on the moon is an American.
- **B. who**

5. Sue likes __________ the kitchen as often as possible.
- **B. cleaning**

6. Tornadoes are storms __________ have the shapes of the funnels.
- **B. which**

7. The students enjoyed the excursion to the city Museum __________ their classmates visited last month.
- **C. where**

8. The eruption of Mount Vesuvius in AD79 destroyed Pompeii __________ was an ancient city of Italy.
- **C. where**

9. This bike is a gift __________ was given to me by my parents on my 10th birthday.
- **D. whose**

10. We are going to __________ the anniversary of our 50th wedding.
- **A. celebrate**

11. The girl was injured in the accident. She is now in hospital. (No blank to fill here)

Feel free to ask if you need any more help!