Here are some books for _____ sister and _____.

Would you like _______ orange juice? —Yes, please.

I think I’ve got a bad cold, Doctor, Shall I take some medicine?—No need. Your body itself is able to the virus. Just drink more water and rest.

I didn’t see you when I went to your office yesterday afternoon. Where were you?—I ____ a meeting in the meeting room.

I had _________ entered the classroom when I noticed the headmaster was sitting at the back.