Choose the correct answer for each following question.
1. I can see a boy .......... a water buffalo.
2. Would you mind .......... the windows?
3. .............. you mind if I smoke?
4. How about ............. to Thai Binh Market?
5. I was reading ............ my sisters were playing with their dolls.
6. Millions of Christmas card ................. every year.
7. The pyramid of cheops is one of the seven ............ of the world.
8. They had the porter ............... their luggage.
9. I take part ........... most youth activities of my school.
10. It’s dangerous ........... in this river.
