Hoàn thành câu

Sure! Here are the completed sentences for the exercises:

**Ex 11: Chọn đúng từ của câu sau:**
1. I **saw** the accident when I was waiting for the taxi.
2. What were you **doing** when I phoned?
3. They didn't **visit** their friends last summer holiday.
4. It **rained** last July.
5. While people were talking to each other, he **read** his book.
6. Chris was **eating** pizza every weekend last month.
7. While we were **running** in the park, Mary fell over.
8. Did you **find** your keys yesterday?
9. Who was she **dancing** with at the party last night?
10. They were **watching** football on TV all day.

**Ex 12: Bài tập thì quá khứ cơ bản với động từ:**
1. When I (arrive) **arrived**, she (go) **went**...
2. Yesterday, we (see) **saw** her at the restaurant.
3. My family (buy) **bought** a new house last month.
4. I (hear) **heard** her crying in the room last night.
5. I used to (like) **like** ice cream but no more.
6. Yesterday, I (go) **went** to school at 6 a.m.
7. Last summer, my family (travel) **traveled** in Da Nang.
8. I (buy) **bought** him a new wallet.
9. My friends and I (stay) **stayed** at home all the weekend.
10. They (get) **got** married last year?

**Ex 13: Complete the following verb in simple tense.**
1. The library **opens** at 7 a.m. and **closes** at 5 p.m. every day.

Feel free to ask if you need further assistance!