We were listening to music when he suddenly appeared.

Listen! Someone is knocking the door.

My father was reading a book when the light went out.

She kept talking about the trip.

I wish I will not go to school tomorrow.

She often cleans the floors on Sunday.

I haven't met him since 1999.

My mother stops the car to ask for a lift.

We wish we will go to the theatre next week.

A new bridge was built in my town last year.

Unless he studies hard, he'll get bad marks.

Do you have any difficulty in learning English?

My father has been to Hanoi many times.

1. Were listening 

2. is knocking 

3. talking 

4. wouldn't go

5. cleans

6. haven't met 

7. to ask 

8. would go 

9. was built

10. studies 

11. learning 

12. has been