1. the lions are fed by the keepers at 3pm everyday.
2. what a silly thing to say?
3. they are lucky so they passed all the exams.
4. i haven't seen him since i was a student.
5. it is dangerous to put a knife into an electrical socket.
6. she didn't allow us to smoke in the house.
7. sue asked hanh about the number of the tourists vistit VN every year.
8. do u mind if i sit here?
9. do you mind helping me to put the chairs away?
10. would you mind if i help you to clean the room