Fill each blank with the correct form of the verb in brackets.

1. - Who ___________ (invent) the World Wide Web?

- Tim Berners-Lee.

2. I can’t leave the classroom until my teacher ___________ (give) me feedback.

3. Naomi ___________ (run) around the park when an apple fell on her head.

4. I hope Viet Nam ___________ (be) a powerful country in cyberspace in about 50 years.

5. My teacher ___________ (say) she was happy to see me become more mature.

6. While I was telling my child a folk story, my husband ___________ (work) at the desk.

7. She found it difficult ___________ (teach) 50 students online.

8. When I was in primary school, I ___________ (not visit) the city zoo.

9. At present, my mother ___________ (prepare) some warm clothes for me to go camping in the forest.

10. I ___________ (try) to climb the ladder to avoid the flood water at 8 p.m. yesterday.

11. The rescue team ___________ (find) two survivors in the collapsed building after the tornado.

12. - The play ___________ (start) at 7 p.m. on Monday. Would you like me to book your ticket in advance?

- If you wouldn't mind.

13. I asked my cousin why he ___________ (not like) watching environmental documentaries.

14. The book fair ___________ (end) before 10 p.m. We should leave there earlier to take the last bus.

15. Mi said her brothers ___________ (draw) a diagram of the solar system then.